0
+86-755-83210559 ext. 811
TOP
Contact Us
SalesDept@heisener.com +86-755-83210559 ext. 811
Language Translation
  • • English
  • • Español
  • • Deutsch
  • • Français
  • • Italiano
  • • Nederlands
  • • Português
  • • русский язык
  • • 日本語
  • • 한국어
  • • 简体中文
  • • 繁體中文

* Please refer to the English Version as our Official Version.

Change Country

If your country is not listed, please select International as your region.

  • International
Americas
  • Argentina
  • Brasil
  • Canada
  • Chile
  • Colombia
  • Costa Rica
  • Dominican Republic
  • Ecuador
  • Guatemala
  • Honduras
  • Mexico
  • Peru
  • Puerto Rico
  • United States
  • Uruguay
  • Venezuela
Asia/Pacific
  • Australia
  • China
  • Hong Kong
  • Indonesia
  • Israel
  • India
  • Japan
  • Korea, Republic of
  • Malaysia
  • New Zealand
  • Philippines
  • Singapore
  • Thailand
  • Taiwan
  • Vietnam
Europe
  • Austria
  • Belgium
  • Bulgaria
  • Switzerland
  • Czech Republic
  • Germany
  • Denmark
  • Estonia
  • Spain
  • Finland
  • France
  • United Kingdom
  • Greece
  • Croatia
  • Hungary
  • Ireland
  • Italy
  • Netherlands
  • Norway
  • Poland
  • Portugal
  • Romania
  • Russian Federation
  • Sweden
  • Slovakia
  • Turkey

ADA4805-2ARMZ

hot ADA4805-2ARMZ

ADA4805-2ARMZ

For Reference Only

Part Number ADA4805-2ARMZ
Manufacturer Analog Devices Inc.
Description IC OPAMP DUAL 105MHZ RRO 8MSOP
Datasheet ADA4805-2ARMZ Datasheet
Package 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
In Stock 252 piece(s)
Unit Price $ 4.96 *
Please request a real-time quote with our sales team. The unit price would influenced by the quantity requested and the supply sources. Thank you!
Lead Time Can Ship Immediately
Estimated Delivery Time Nov 20 - Nov 25 (Choose Expedited Shipping)
Winter Hot Sale

* Free Shipping * Up to $100 Discount

Winter Hot Sale

Request for Quotation

ADA4805-2ARMZ

Quantity
  • We are offering ADA4805-2ARMZ for competitive price in the global market, please send us a quota request for pricing. Thank you!
  • To process your RFQ, please add ADA4805-2ARMZ with quantity into BOM. Heisener.com does NOT require any registration to request a quote of ADA4805-2ARMZ.
  • To learn about the specification of ADA4805-2ARMZ, please search the datasheet by clicking the link above. If you couldn't find the correct datasheet, please refer to the manufacturer's official datasheet.
Payment Methods
Delivery Services

Do you have any question about ADA4805-2ARMZ?

+86-755-83210559 ext. 811 SalesDept@heisener.com heisener007 2354944915 Send Message

Certified Quality

Heisener's commitment to quality has shaped our processes for sourcing, testing, shipping, and every step in between. This foundation underlies each component we sell.

ISO9001:2015, ICAS, IAF, UKAS

View the Certificates

ADA4805-2ARMZ Specifications

ManufacturerAnalog Devices Inc.
CategoryIntegrated Circuits (ICs) - Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Datasheet ADA4805-2ARMZ Datasheet
Package8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Series-
Amplifier TypeGeneral Purpose
Number of Circuits2
Output TypeRail-to-Rail
Slew Rate160 V/µs
-3db Bandwidth105MHz
Current - Input Bias470nA
Voltage - Input Offset9µV
Current - Supply500µA
Current - Output / Channel73mA
Voltage - Supply, Single/Dual (��)3 V ~ 5 V, ��1.5 V ~ 5 V
Operating Temperature-40°C ~ 125°C
Mounting TypeSurface Mount
Package / Case8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package8-MSOP

ADA4805-2ARMZ Datasheet

Page 1

Page 2

0.2 µV/°C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifiers Data Sheet ADA4805-1/ADA4805-2 FEATURES Low input offset voltage: 125 µV (maximum) Low input offset voltage drift 0.2 µV/°C (typical) 1.5 µV/°C (maximum) Ultralow supply current: 500 µA per amplifier Fully specified at VS = 3 V, 5 V, ±5 V High speed performance −3 dB bandwidth: 105 MHz Slew rate: 160 V/µs Settling time to 0.1%: 35 ns Rail-to-rail outputs Input common-mode range: −VS − 0.1 V to +VS − 1 V Low noise: 5.9 nV/√Hz at 100 kHz; 0.6 pA/√Hz at 100 kHz Low distortion: −102 dBc/−126 dBc HD2/HD3 at 100 kHz Low input bias current: 470 nA (typical) Dynamic power scaling Turn-on time: 3 µs (maximum) fully settled Small packaging 6-lead SC70, 6-lead SOT-23, and 8-lead MSOP APPLICATIONS High resolution, high precision analog-to-digital converter (ADC) drivers Battery-powered instrumentation Micropower active filters Portable point of sales terminals Active RFID readers Photo multipliers ADC reference buffers GENERAL DESCRIPTION The ADA4805-1/ADA4805-2 are high speed voltage feedback, rail-to-rail output amplifiers with an exceptionally low quiescent current of 500 µA, making them ideal for low power, high resolution data conversion systems. Despite being low power, these amplifiers provide excellent overall performance. They offer a high bandwidth of 105 MHz at a gain of +1, a high slew rate of 160 V/µs, and a low input offset voltage of 125 µV (maximum). A shutdown pin allows further reduction of the quiescent supply current to 2.9 µA. For power sensitive applications, the shutdown mode offers a very fast turn-on time of 3 µs. This allows the user to dynamically manage the power of the amplifier by turning the amplifier off between ADC samples. TYPICAL APPLICATIONS CIRCUIT AD7980 C2 10µF IN+ IN– GND VDDREF C3 0.1µF C4 100nF VDD C1 2.7nF R3 20Ω +7.5V +7.5V ADA4805-1/ ADA4805-2 ADA4805-1/ ADA4805-2ADR435 5V REF 0V TO VREF 11 34 5- 01 0 Figure 1. Driving the AD7980 with the ADA4805-1/ADA4805-2 The Analog Devices, Inc., proprietary extra fast complementary bipolar (XFCB) process allows both low voltage and low current noise (5.9 nV/√Hz, 0.6 pA/√Hz). The ADA4805-1/ADA4805-2 operate over a wide range of supply voltages from ±1.5 V to ±5 V, as well as single 3 V and 5 V supplies, making them ideal for high speed, low power instruments. The ADA4805-1 is available in a 6-lead SOT-23 and a 6-lead SC70 package. The ADA4805-2 is available in an 8-lead MSOP and a 10-lead LFCSP package. These amplifiers are rated to work over the industrial temperature range of −40°C to +125°C. 0 8020 40 60 70503010 FREQUENCY (kHz) –20 0 –40 –60 –80 –100 A M PL IT U D E (d B ) –120 –140 –160 –180 11 34 5- 10 2 INPUT FREQUENCY = 10kHz SNR = 89.4dB THD = 104dB SINAD = 89.3dB Figure 2. FFT Plot for the Circuit Configuration in Figure 1 Table 1. Complementary ADCs to the ADA4805-1/ADA4805-2 Product ADC Power (mW) Throughput (MSPS) Resolution (Bits) SNR (dB) AD7982 7.0 1 18 98 AD7984 10.5 1.33 18 98.5 AD7980 4.0 1 16 91 AD7685 10 0.25 16 88 Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

Page 3

ADA4805-1/ADA4805-2 Data Sheet Rev. B | Page 2 of 25 TABLE OF CONTENTS Features .............................................................................................. 1  Applications ....................................................................................... 1  General Description ......................................................................... 1  Typical Applications Circuit ............................................................ 1  Revision History ............................................................................... 2  Specifications ..................................................................................... 3  ±5 V Supply ................................................................................... 3  5 V Supply ...................................................................................... 4  3 V Supply ...................................................................................... 5  Absolute Maximum Ratings ............................................................ 7  Thermal Resistance ...................................................................... 7  Maximum Power Dissipation ..................................................... 7  ESD Caution .................................................................................. 7  Pin Configurations and Function Descriptions ........................... 8  Typical Performance Characteristics ........................................... 10  Test Circuits ..................................................................................... 17  Theory of Operation ...................................................................... 18  Amplifier Description ................................................................ 18  Input Protection ......................................................................... 18  Shutdown Operation .................................................................. 18  Noise Considerations ................................................................. 19  Applications Information .............................................................. 20  Slew Enhancement ..................................................................... 20  Effect of Feedback Resistor on Frequency Response ............ 20  Compensating Peaking in Large Signal Frequency Response ....................................................................................................... 20  Driving Low Power, High Resolution Successive Approximation Register (SAR) ADCs..................................... 20  Dynamic Power Scaling ............................................................. 21  Single-Ended to Differential Conversion ................................... 23  Layout Considerations ............................................................... 23  Outline Dimensions ....................................................................... 24  Ordering Guide .......................................................................... 25  REVISION HISTORY 12/14—Rev. A to Rev. B Added 10-Lead LFCSP ....................................................... Universal Changes to SHUTDOWN Current Parameter, Table 2 ................ 3 Changes to SHUTDOWN Current Parameter, Table 3 ................ 5 Changes to SHUTDOWN Current Parameter, Table 4 ................ 6 Changes to Table 6 and Figure 3 ...................................................... 7 Changes to Table 8 ............................................................................. 9 Added Figure 6, Renumbered Sequentially ................................... 9 Added Figure 42 ............................................................................... 16 Changed Layout ............................................................................... 16 Changes to Shutdown Operation Section .................................... 18 Changes to Dynamic Power Scaling Section and Figure 61 ...... 21 Changes to Figure 62 and Figure 63 .............................................. 22 Updated Outline Dimensions ........................................................ 25 Changes to Ordering Guide ........................................................... 25 9/14—Rev. 0 to Rev. A Added ADA4805-2 ............................................................. Universal Changes to Features Section, General Description Section, and Table 1 ................................................................................................. 1 Changes to Table 2 ............................................................................. 3 Changes to Table 3 ............................................................................. 4 Changes to Table 4 ............................................................................. 5 Changes to Table 6 and Figure 3 ...................................................... 7 Added Figure 6; Renumbered Sequentially; and Table 8; Renumbered Sequentially ................................................................. 8 Changes to Figure 7 Caption, Figure 8 Caption, Figure 9 Caption, Figure 10 Caption, and Figure 11 Caption..................... 9 Changes to Figure 13 Caption, Figure 14, Figure 17, and Figure 18 ........................................................................................... 10 Change to Figure 29 ........................................................................ 12 Moved Figure 41 .............................................................................. 15 Changes to Figure 42 ....................................................................... 15 Added Figure 43 .............................................................................. 15 Changes to Figure 47 and Figure 48.............................................. 16 Changes to Amplifier Description Section, Input Protection Section, Shutdown Operation Section, and Figure 51................ 17 Changes to Noise Considerations Section and Figure 52 .......... 18 Changes to Effect of Feedback Resistor on Frequency Response Section, Compensating Peaking in Large Signal Frequency Response Section, Figure 57, and Driving Low Power, High Resolution Successive Approximation Register (SAR) ADC Section ............................................................................................... 19 Changes to Figure 58, Dynamic Power Scaling Section, Figure 59, and Table 10 ................................................................... 20 Change to Figure 60 ........................................................................ 21 Changes to Single-Ended to Differential Conversion Section, Table 11, and Figure 62 ................................................................... 22 Updated Outline Dimensions, Figure 65 ..................................... 24 Changes to Ordering Guide ........................................................... 24 7/14—Revision 0: Initial Version

Page 4

Data Sheet ADA4805-1/ADA4805-2 SPECIFICATIONS ±5 V SUPPLY VS = ±5 V at TA = 25°C; RF = 0 Ω for G = +1; otherwise, RF = 1 kΩ; RL = 2 kΩ to ground; unless otherwise noted. All specifications are per amplifier. Table 2. Parameter Test Conditions/Comments Min Typ Max Unit DYNAMIC PERFORMANCE −3 dB Bandwidth G = +1, VOUT = 0.02 V p-p 120 MHz G = +1, VOUT = 2 V p-p 40 MHz Bandwidth for 0.1 dB Flatness G = +1, VOUT = 0.02 V p-p 18 MHz Slew Rate G = +1, VOUT = 2 V step 190 V/µs G = +2, VOUT = 4 V step 250 V/µs Settling Time to 0.1% G = +1, VOUT = 2 V step 35 ns G = +2, VOUT = 4 V step 78 ns NOISE/DISTORTION PERFORMANCE Harmonic Distortion, HD2/HD31 fC = 20 kHz, VOUT = 2 V p-p −114/−140 dBc fC = 100 kHz, VOUT = 2 V p-p −102/−128 dBc fC = 20 kHz, VOUT = 4 V p-p, G = +1 −109/−143 dBc fC = 100 kHz, VOUT = 4 V p-p, G = +1 −93/−130 dBc fC = 20 kHz, VOUT = 4 V p-p, G = +2 −113/−142 dBc fC = 100 kHz, VOUT = 4 V p-p, G = +2 −96/−130 dBc Input Voltage Noise f = 100 kHz 5.2 nV/√Hz Input Voltage Noise 1/f Corner Frequency 8 Hz 0.1 Hz to 10 Hz Voltage Noise 44 nV rms Input Current Noise f = 100 kHz 0.7 pA/√Hz DC PERFORMANCE Input Offset Voltage 13 125 µV Input Offset Voltage Drift2 TMIN to TMAX, 4 σ 0.2 1.5 µV/°C Input Bias Current 550 800 nA Input Offset Current 2.1 25 nA Open-Loop Gain VOUT = −4.0 V to +4.0 V 107 111 dB INPUT CHARACTERISTICS Input Resistance Common Mode 50 MΩ Differential Mode 260 kΩ Input Capacitance 1 pF Input Common-Mode Voltage Range −5.1 +4 V Common-Mode Rejection Ratio VIN, CM = −4.0 V to +4.0 V 103 130 dB SHUTDOWN PIN SHUTDOWN Voltage Low Powered down <−1.3 V High Enabled >−0.9 V SHUTDOWN Current Low Powered down −1.0 0.2 µA High Enabled 0.02 1.0 µA Turn-Off Time 50% of SHUTDOWN to <10% of enabled quiescent current 1.25 2.75 µs Turn-On Time 50% of SHUTDOWN to >90% of final VOUT 2 3 µs OUTPUT CHARACTERISTICS Output Overdrive Recovery Time (Rising/Falling Edge) VIN = +6 V to −6 V, G = +2 95/100 ns Output Voltage Swing RL = 2 kΩ −4.98 +4.98 V Rev. B | Page 3 of 25

Page 5

ADA4805-1/ADA4805-2 Data Sheet Parameter Test Conditions/Comments Min Typ Max Unit Short-Circuit Current Sinking/sourcing 85/73 mA Linear Output Current <1% THD at 100 kHz, VOUT = 2 V p-p ±58 mA Off Isolation VIN = 0.5 V p-p, f = 1 MHz, SHUTDOWN = −VS 41 dB Capacitive Load Drive 30% overshoot 15 pF POWER SUPPLY Operating Range 2.7 10 V Quiescent Current per Amplifier Enabled 570 625 µA SHUTDOWN = −VS 7.4 12 µA Power Supply Rejection Ratio Positive +VS = 3 V to 5 V, −VS = −5 V 100 119 dB Negative +VS = 5 V, −VS = −3 V to −5 V 100 122 dB 1 fC is the fundamental frequency. 2 Guaranteed, but not tested. 5 V SUPPLY VS = 5 V at TA = 25°C; RF = 0 Ω for G = +1; otherwise, RF = 1 kΩ; RL = 2 kΩ to midsupply; unless otherwise noted. All specifications are per amplifier. Table 3. Parameter Test Conditions/Comments Min Typ Max Unit DYNAMIC PERFORMANCE −3 dB Bandwidth G = +1, VOUT = 0.02 V p-p 105 MHz G = +1, VOUT = 2 V p-p 35 MHz Bandwidth for 0.1 dB Flatness G = +1, VOUT = 0.02 V p-p 20 MHz Slew Rate G = +1, VOUT = 2 V step 160 V/µs G = +2, VOUT = 4 V step 220 V/µs Settling Time to 0.1% G = +1, VOUT = 2 V step 35 ns G = +2, VOUT = 4 V step 82 ns NOISE/DISTORTION PERFORMANCE Harmonic Distortion, HD2/HD31 fC = 20 kHz, VOUT = 2 V p-p −114/−135 dBc fC = 100 kHz, VOUT = 2 V p-p −102/−126 dBc fC = 20 kHz, G = +2, VOUT = 4 V p-p −107/−143 dBc fC = 100 kHz, G = +2, VOUT = 4 V p-p −90/−130 dBc Input Voltage Noise f = 100 kHz 5.9 nV/√Hz Input Voltage Noise 1/f Corner 8 Hz 0.1 Hz to 10 Hz Voltage Noise 54 nV rms Input Current Noise f = 100 kHz 0.6 pA/√Hz DC PERFORMANCE Input Offset Voltage 9 125 µV Input Offset Voltage Drift2 TMIN to TMAX, 4 σ 0.2 1.5 µV/°C Input Bias Current 470 720 nA Input Offset Current 0.4 nA Open-Loop Gain VOUT = 1.25 V to 3.75 V 105 109 dB INPUT CHARACTERISTICS Input Resistance Common Mode 50 MΩ Differential Mode 260 kΩ Input Capacitance 1 pF Input Common-Mode Voltage Range −0.1 +4 V Common-Mode Rejection Ratio VIN, CM = 1.25 V to 3.75 V 103 133 dB Rev. B | Page 4 of 25

Page 6

Data Sheet ADA4805-1/ADA4805-2 Parameter Test Conditions/Comments Min Typ Max Unit SHUTDOWN PIN SHUTDOWN Voltage Low Powered down <1.5 V High Enabled >1.9 V SHUTDOWN Current Low Powered down −1.0 0.1 µA High Enabled 0.01 1.0 µA Turn-Off Time 50% of SHUTDOWN to <10% of enabled quiescent current 0.9 1.25 µs Turn-On Time 50% of SHUTDOWN to >90% of final VOUT 3 4 µs OUTPUT CHARACTERISTICS Overdrive Recovery Time (Rising/Falling Edge) VIN = −1 V to +6 V, G = +2 130/145 ns Output Voltage Swing RL = 2 kΩ 0.02 4.98 V Short-Circuit Current Sinking/sourcing 73/63 mA Linear Output Current <1% THD at 100 kHz, VOUT = 2 V p-p ±47 mA Off Isolation VIN = 0.5 V p-p, f = 1 MHz, SHUTDOWN = −VS 41 dB Capacitive Load Drive 30% overshoot 15 pF POWER SUPPLY Operating Range 2.7 10 V Quiescent Current per Amplifier Enabled 500 520 µA SHUTDOWN = −VS 2.9 4 µA Power Supply Rejection Ratio Positive +VS = 1.5 V to 3.5 V, −VS = −2.5 V 100 120 dB Negative +VS = 2.5 V, −VS = −1.5 V to −3.5 V 100 126 dB 1 fC is the fundamental frequency. 2 Guaranteed, but not tested. 3 V SUPPLY VS = 3 V at TA = 25°C; RF = 0 Ω for G = +1; otherwise, RF = 1 kΩ; RL = 2 kΩ to midsupply; unless otherwise noted. All specifications are per amplifier. Table 4. Parameter Test Conditions/Comments Min Typ Max Unit DYNAMIC PERFORMANCE −3 dB Bandwidth G = +1, VOUT = 0.02 V p-p 95 MHz G = +1, VOUT = 1 V p-p, +VS = 2 V, −VS = −1 V 30 MHz Bandwidth for 0.1 dB Flatness G = +1, VOUT = 0.02 V p-p 35 MHz Slew Rate G = +1, VOUT = 1 V step, +VS = 2 V, −VS = −1 V 85 V/µs Settling Time to 0.1% G = +1, VOUT = 1 V step 41 ns NOISE/DISTORTION PERFORMANCE Harmonic Distortion, HD2/HD31 fC = 20 kHz, VOUT = 1 V p-p, +VS = 2 V, −VS = −1 V −123/−143 dBc fC = 100 kHz, VOUT = 1 V p-p, +VS = 2 V, −VS = −1 V −107/−133 dBc Input Voltage Noise f = 100 kHz 6.3 nV/√Hz Input Voltage Noise 1/f Corner 8 Hz 0.1 Hz to 10 Hz Voltage Noise 55 nV rms Input Current Noise f = 100 kHz 0.8 pA/√Hz Rev. B | Page 5 of 25

Page 7

ADA4805-1/ADA4805-2 Data Sheet Parameter Test Conditions/Comments Min Typ Max Unit DC PERFORMANCE Input Offset Voltage 7 125 µV Input Offset Voltage Drift2 TMIN to TMAX, 4 σ 0.2 1.5 µV/°C Input Bias Current 440 690 nA Input Offset Current 0.5 nA Open-Loop Gain VOUT = 1.1 V to 1.9 V 100 107 dB INPUT CHARACTERISTICS Input Resistance Common Mode 50 MΩ Differential Mode 260 kΩ Input Capacitance 1 pF Input Common-Mode Voltage Range −0.1 +2 V Common-Mode Rejection Ratio VIN, CM = 0.5 V to 2 V 89 117 dB SHUTDOWN PIN SHUTDOWN Voltage Low Powered down <0.7 V High Enabled >1.1 V SHUTDOWN Current Low Powered down −1.0 0.1 µA High Enabled 0.01 1.0 µA Turn-Off Time 50% of SHUTDOWN to <10% of enabled quiescent current 0.9 1.25 µs Turn-On Time 50% of SHUTDOWN to >90% of final VOUT 7 8 µs OUTPUT CHARACTERISTICS Output Overdrive Recovery Time (Rising/Falling Edge) VIN = −1 V to +4 V, G = +2 135/175 ns Output Voltage Swing RL = 2 kΩ 0.02 2.98 V Short-Circuit Current Sinking/sourcing 65/47 mA Linear Output Current <1% THD at 100 kHz, VOUT = 1 V p-p ±40 mA Off Isolation VIN = 0.5 V p-p, f = 1 MHz, SHUTDOWN = −VS 41 dB Capacitive Load Drive 30% overshoot 15 pF POWER SUPPLY Operating Range 2.7 10 V Quiescent Current per Amplifier Enabled 470 495 µA SHUTDOWN = −VS 1.3 3 µA Power Supply Rejection Ratio Positive +VS = 1.5 V to 3.5 V, −VS = −1.5 V 96 119 dB Negative +VS = 1.5 V, −VS = −1.5 V to −3.5 V 96 125 dB 1 fC is the fundamental frequency. 2 Guaranteed, but not tested. Rev. B | Page 6 of 25

Page 8

Data Sheet ADA4805-1/ADA4805-2 Rev. B | Page 7 of 25 ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Rating Supply Voltage 11 V Power Dissipation See Figure 3 Common-Mode Input Voltage −VS − 0.7 V to +VS + 0.7 V Differential Input Voltage ±1 V Storage Temperature Range −65°C to +125°C Operating Temperature Range −40°C to +125°C Lead Temperature (Soldering, 10 sec) 300°C Junction Temperature 150°C Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. THERMAL RESISTANCE θJA is specified for the worst case conditions, that is, θJA is specified for a device soldered in a circuit board for surface-mount packages. Table 6 lists the θJA for the ADA4805-1/ADA4805-2. Table 6. Thermal Resistance Package Type θJA Unit 6-Lead SC70 223.6 °C/W 6-Lead SOT-23 209.1 °C/W 8-Lead MSOP 123.8 °C/W 10-Lead LFCSP 51.4 °C/W MAXIMUM POWER DISSIPATION The maximum safe power dissipation for the ADA4805-1/ ADA4805-2 is limited by the associated rise in junction temperature (TJ) on the die. At approximately 150C, which is the glass transition temperature, the properties of the plastic change. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ADA4805-1/ADA4805-2. Exceeding a junction temperature of 175C for an extended period of time can result in changes in silicon devices, potentially causing degradation or loss of functionality. The power dissipated in the package (PD) is the sum of the quiescent power dissipation and the power dissipated in the die due to the ADA4805-1/ADA4805-2 output load drive. The quiescent power dissipation is the voltage between the supply pins (VS) multiplied by the quiescent current (IS). PD = Quiescent Power + (Total Drive Power − Load Power)   L OUT L OUTS SSD R V R VV IVP 2 2        RMS output voltages must be considered. If RL is referenced to −VS, as in single-supply operation, the total drive power is VS × IOUT. If the rms signal levels are indeterminate, consider the worst case, when VOUT = VS/4 for RL to midsupply.     L S SSD R V IVP 24/  In single-supply operation with RL referenced to −VS, worst case is VOUT = VS/2. Airflow increases heat dissipation, effectively reducing θJA. Also, more metal directly in contact with the package leads and exposed pad from metal traces, through holes, ground, and power planes reduces θJA. Figure 3 shows the maximum safe power dissipation in the package vs. the ambient temperature on a JEDEC standard, 4-layer board. θJA values are approximations. M A X IM U M P O W E R D IS S IP A T IO N ( W ) 11 34 5- 01 10 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 –50 –30 –10 10 30 50 70 90 110 130 AMBIENT TEMPERATURE (°C) TJ = 150°C 6-LEAD SC70 6-LEAD SOT-23 8-LEAD MSOP 10-LEAD LFCSP Figure 3. Maximum Power Dissipation vs. Temperature for a 4-Layer Board ESD CAUTION

Page 9

ADA4805-1/ADA4805-2 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS VOUT 1 –VS 2 +IN 3 +VS ADA4805-1 6 SHUTDOWN5 –IN4 11 34 5- 00 1 Figure 4. 6-Lead SC70 Pin Configuration VOUT 1 –VS 2 +IN 3 +VS6 SHUTDOWN5 –IN4 11 34 5- 00 2 ADA4805-1 Figure 5. 6-Lead SOT-23 Pin Configuration Table 7. ADA4805-1 Pin Function Descriptions Pin No. Mnemonic Description 1 VOUT Output. 2 −VS Negative Supply. 3 +IN Noninverting Input. 4 −IN Inverting Input. 5 SHUTDOWN Active Low Power-Down. 6 +VS Positive Supply. Rev. B | Page 8 of 25

Page 10

Data Sheet ADA4805-1/ADA4805-2 Rev. B | Page 9 of 25 1VOUT1 2–IN1 3+IN1 4–VS 5SHUTDOWN1 10 +VS NOTES 1. THE EXPOSED PAD CAN BE CONNECTED TO GROUND OR POWER PLANES, OR IT CAN BE LEFT FLOATING. 9 VOUT2 8 –IN2 7 +IN2 6 SHUTDOWN2 11 34 5- 00 3 ADA4805-2 Figure 6. 10-Lead LFCSP Pin Configuration VOUT1 1 –IN1 2 +IN1 3 –VS 4 +VS8 VOUT27 –IN26 +IN25 11 34 5- 00 4 ADA4805-2 Figure 7. 8-Lead MSOP Pin Configuration Table 8. ADA4805-2 Pin Function Descriptions Pin No. 10-Lead LFCSP 8-Lead MSOP1 Mnemonic Description 1 1 VOUT1 Output 1. 2 2 −IN1 Inverting Input 1. 3 3 +IN1 Noninverting Input 1. 4 4 −VS Negative Supply. 5 N/A SHUTDOWN1 Active Low Power-Down 1. 6 N/A SHUTDOWN2 Active Low Power-Down 2. 7 5 +IN2 Noninverting Input 2. 8 6 −IN2 Inverting Input 2. 9 7 VOUT2 Output 2. 10 8 +VS Positive Supply. N/A EPAD Exposed Pad. For the 10-Lead LFCSP, the EPAD can be connected to ground or power planes, or it can be left floating. 1 N/A means not applicable.

Page 11

ADA4805-1/ADA4805-2 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS RL = 2 kΩ, unless otherwise noted. When G = +1, RF = 0 Ω. –12 –9 –6 –3 0 3 0.1 1 10 100 1000 N O R M A LI ZE D C LO SE D -L O O P G A IN (d B ) FREQUENCY (MHz) G = +1 G = +10 VS = ±2.5V VOUT = 20mV p-p RL = 2kΩ RF = 1kΩ G = +5 G = +2 11 34 5- 20 6 Figure 8. Small Signal Frequency Response for Various Gains –12 –9 –6 –3 0 3 0.1 1 10 100 1000 C LO SE D -L O O P G A IN (d B ) FREQUENCY (MHz) VS = ±2.5V G = +1 VOUT = 20mV p-p RL = 2kΩ –40°C +25°C +125°C 11 34 5- 20 8 Figure 9. Small Signal Frequency Response for Various Temperatures –12 –9 –6 –3 0 3 0.1 1 10 100 1000 C LO SE D -L O O P G A IN (d B ) FREQUENCY (MHz) G = +1 VOUT = 20mV p-p RL = 2kΩ VS = ±1.5V VS = ±2.5V VS = ±5V 11 34 5- 20 7 Figure 10. Small Signal Frequency Response for Various Supply Voltages –12 –9 –6 –3 0 3 0.1 1 10 100 N O R M A LI ZE D C LO SE D -L O O P G A IN (d B ) FREQUENCY (MHz) 113 45 -0 15 VS = ±2.5V VOUT = 2V p-p RF = 1kΩ RL = 2kΩ G = +2 G = +5 G = +10 G = +1 Figure 11. Large Signal Frequency Response for Various Gains –9 –6 –3 0 3 0.1 1 10 100 C LO SE D -L O O P G A IN (d B ) FREQUENCY (MHz) 113 45 -0 16 VS = ±2.5V G = +1 VOUT = 2V p-p RL = 2kΩ +25°C +125°C –40°C Figure 12. Large Signal Frequency Response for Various Temperatures FREQUENCY (MHz) –6 –3 0 3 0.1 1 10 100 1000 C LO SE D -L O O P G A IN (d B ) VS = ±2.5V G = +1 RL = 2kΩ VOUT = 20mV p-p VOUT = 0.5V p-p VOUT = 2V p-p VOUT = 100mV p-p 11 34 5- 21 1 Figure 13. Frequency Response for Various Output Voltages Rev. B | Page 10 of 25

Page 12

Data Sheet ADA4805-1/ADA4805-2 Rev. B | Page 11 of 25 –12 –9 –6 –3 0 3 6 9 12 1 10 100 C L O S E D -L O O P G A IN ( d B ) FREQUENCY (MHz) CL = 15pF CL = 10pF CL = 5pF CL = 0pF CL = 15pF, RS = 226Ω VS = ±2.5V VIN = 20mV p-p G = +1 RL = 2kΩ 11 34 5- 30 9 Figure 14. Small Signal Frequency Response for Various Capacitive Loads (See Figure 46) –160 –150 –140 –130 –120 –110 –100 –90 –80 –70 –60 –50 1 10 100 1000 D IS T O R T IO N ( d B c) FREQUENCY (kHz) HD2, G = +1 VS = ±5V, VOUT = 4V p-p HD2, G = +2 HD3, G = +1 HD3, G = +2 11 34 5- 51 4 Figure 15. Distortion vs. Frequency for Various Gains –140 –130 –120 –110 –100 –90 –80 –70 –60 –50 –40 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 T O TA L H A R M O N IC D IS T O R T IO N ( d B ) OUTPUT VOLTAGE (V peak) INPUT COMMON-MODE VOLTAGE UPPER LIMIT (+VS – 1V) VS = ±2.5V VIN, CM = 0V G = +1 RL = 2kΩ VIN = 1MHz VIN = 100kHz VIN = 10kHz 11 34 5- 31 6 Figure 16. Total Harmonic Distortion vs. Output Voltage For Various Frequencies –0.6 –0.5 –0.4 –0.3 –0.2 –0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 1 10 100 C L O S E D -L O O P G A IN ( d B ) FREQUENCY (MHz) 11 34 5- 11 0 VS = ±2.5V G = +1 RL = 2kΩ VOUT = 20mV p-p Figure 17. Small Signal 0.1 dB Bandwidth –160 –150 –140 –130 –120 –110 –100 –90 –80 –70 –60 –50 1 10 100 1000 D IS T O R T IO N ( d B c) FREQUENCY (kHz) HD3 VS = +2V/–1V HD3 VS = ±5V HD3 VS = ±2.5V HD2 VS = +2V/–1V HD2 VS = ±5V HD2 VS = ±2.5V VS = ±5V, VOUT = 2V p-p VS = ±2.5V, VOUT = 2V p-p VS = +2V/–1V, VOUT = 1V p-p 11 34 5- 51 7 Figure 18. Distortion vs. Frequency for Various Supplies, G = +1 –160 –150 –140 –130 –120 –110 –100 –90 –80 –70 –60 –50 1 10 100 1000 D IS T O R T IO N ( d B c) FREQUENCY (kHz) HD2 VS = ±2.5V HD2 VS = +2V/–1V HD3 VS = +2V/–1V HD3 VS = ±2.5V HD2 VS = ±5V HD3 VS = ±5V VS = ±5V, VOUT = 4V p-p VS = ±2.5V, VOUT = 4V p-p VS = +2V/–1V, VOUT = 1V p-p 11 34 5- 51 8 Figure 19. Distortion vs. Frequency, G = +2

Page 13

ADA4805-1/ADA4805-2 Data Sheet Rev. B | Page 12 of 25 0 10 20 30 40 50 60 70 80 90 0.1 1 10 100 1k 10k 100k 1M 10M 100M V O LT A G E N O IS E ( 10 n V /√ H z) FREQUENCY (Hz) VS = ±2.5V 11 34 5- 21 9 Figure 20. Voltage Noise vs. Frequency –300 –250 –200 –150 –100 –50 0 50 100 150 200 250 300 0 1 2 3 4 5 6 7 8 9 10 A M P L IT U D E ( n V ) TIME (Seconds) VS = ±2.5V AVERAGE NOISE = 54nV rms 11 34 5- 31 8 Figure 21. 0.1 Hz to 10 Hz Voltage Noise –140 –120 –100 –80 –60 –40 –20 0 20 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –PSRR +PSRR CMRR C M R R , P S R R ( d B ) VS = ±2.5V ∆VS, ∆VCM = 100mV p-p 11 34 5- 23 2 Figure 22. CMRR, PSRR vs. Frequency 0 2 4 6 8 10 12 1 10 100 1k 100k10k C U R R E N T N O IS E ( p A /√ H z) FREQUENCY (Hz) 10M1M VS = +2.5V G = +1 11 34 5- 01 8 Figure 23. Current Noise vs. Frequency (See Figure 47) 300 350 400 450 500 550 600 650 700 750 800 –40 –25 –10 5 20 35 50 65 80 95 110 125 Q U IE S C E N T S U P P LY C U R R E N T ( µ A ) TEMPERATURE (°C) 11 34 5- 25 6 VS = ±2.5V VS = ±1.5V VS = ±5V Figure 24. Quiescent Supply Current vs. Temperature for Various Supplies –90 –80 –70 –60 –50 –40 –30 –20 –10 0.01 0.1 1 10 100 IS O L A T IO N ( d B ) FREQUENCY (MHz) 11 34 5- 01 7 VS = ±2.5V G = +1 RL = 2kΩ VIN = 0.5V p-p SHUTDOWN = –2.5V Figure 25. Forward/Off Isolation vs. Frequency

Page 14

Data Sheet ADA4805-1/ADA4805-2 Rev. B | Page 13 of 25 0 5 10 15 20 25 30 P E R C E N TA G E O F U N IT S ( % ) INPUT OFFSET VOLTAGE (µV) 11 34 5- 01 9 SOT-23 VS = ±2.5V 300 UNITS = 7.5µV σ = 14.5µV SC70 VS = ±2.5V 300 UNITS = 10.2µV σ = 18.9 µV SC70 SOT-23 –120 –100 –80 –60 –40 –20 0 20 40 60 80 100 120 Figure 26. Input Offset Voltage Distribution –100 –80 –60 –40 –20 0 20 40 60 80 100 –3.0 –2.5 –2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 IN P U T O F F S E T V O LT A G E ( µ V ) INPUT COMMON-MODE VOLTAGE (V) VS = ±2.5V 10 UNITS 11 34 5- 32 7 Figure 27. Input Offset Voltage vs. Input Common-Mode Voltage –40 –25 –10 5 20 35 50 65 80 95 110 125 IN P U T B IA S C U R R E N T ( n A ) TEMPERATURE (°C) 11 34 5- 25 7 VS = ±2.5V VS = ±1.5V VS = ±5V 390 410 430 450 470 490 510 530 550 570 590 610 630 650 Figure 28. Input Bias Current vs. Temperature for Various Supplies (See Figure 48) 0 5 10 15 20 25 30 35 –1.6–1.9 1.9–1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 P E R C E N TA G E O F U N IT S ( % ) INPUT OFFSET VOLTAGE DRIFT (µV/°C) VS = ±2.5V T = –40°C TO +125°C 297 UNITS SOLDERED TO PCB = –0.19µV/°C σ = 0.28µV/°C 11 34 5- 32 3 Figure 29. Input Offset Voltage Drift Distribution –150 –100 –50 0 50 100 150 –40 –25 –10 5 20 35 50 65 80 95 110 125 IN P U T O F F S E T V O LT A G E ( µ V ) TEMPERATURE (°C) VS = ±2.5V 30 UNITS 11 34 5- 01 3 Figure 30. Input Offset Voltage vs. Temperature –6 –4 –2 0 2 4 6 –800 –750 –700 –650 –600 –550 –500 –450 –400 –0.4 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 IN P U T O F F S E T C U R R E N T ( n A ) IN P U T B IA S C U R R E N T ( n A ) INPUT COMMON-MODE VOLTAGE (V) 11 34 5- 13 5 INPUT OFFSET CURRENT IB+ IB– Figure 31. Input Bias Current and Input Offset Current vs. Input Common-Mode Voltage

Page 15

ADA4805-1/ADA4805-2 Data Sheet 11 34 5- 02 4 –15 –10 –5 0 5 10 15 0 50 100 150 200 250 300 O U TP U T VO LT A G E (m V) TIME (ns) G = +1 VOUT = 20mV p-p VS = ±5V VS = ±1.5V VS = ±2.5V Figure 32. Small Signal Transient Response for Various Supplies, G = +1 0 100 200 300 400 500 TIME (ns) 600 700 800 900 1000 –3 –4 –2 –1 0 1 2 3 4 IN PU T A N D O U TP U T VO LT A G E (V ) 11 34 5- 12 8 VS = ±2.5V G = +1VIN VOUT Figure 33. Input Overdrive Recovery Time, G = +1 VS = +5V G = +1 VOUT = 2V STEP RL = 2kΩ SE TT LI N G (% ) –0.3 –0.2 –0.1 0 0.1 0.2 0.3 0 20 40 60 80 100 TIME (ns) 120 140 160 180 11 34 5- 03 0 Figure 34. Settling Time to 0.1% –1.5 –1.0 –0.5 0 0.5 1.0 1.5 0 50 100 150 200 250 350300 O U TP U T VO LT A G E (V ) TIME (ns) VS = ±1.5V, VIN, CM = –0.5V, VOUT = 1V p-p VS = ±2.5V, VIN, CM = 0V, VOUT = 2V p-p VS = ±5V, VIN, CM = 0V, VOUT = 2V p-p 11 34 5- 02 5 G = +1 Figure 35. Large Signal Transient Response for Various Supplies, G = +1 –5 –4 –3 –2 –1 0 1 2 3 4 5 IN PU T A N D O U TP U T VO LT A G E (V ) 11 34 5- 12 9 VS = ±2.5V G = +22×VIN VOUT 0 100 200 300 400 500 TIME (ns) 600 700 800 900 1000 Figure 36. Output Overdrive Recovery Time, G = +2 –180 –160 –140 –120 –100 –80 –60 –40 –20 0 –20 0 20 40 60 80 100 120 10 100 1k 10k 100k 1M 10M 100M O PE N -L O O P PH A SE (D eg re es ) O PE N -L O O P G A IN (d B ) FREQUENCY (Hz) GAIN PHASE 11 34 5- 02 6 Figure 37. Open-Loop Gain and Phase Margin Rev. B | Page 14 of 25

Page 16

Data Sheet ADA4805-1/ADA4805-2 –0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 1 2 3 4 5 6 O U TP U T VO LT A G E (V ) TIME (µs) +25˚C –40˚C +125˚C 11 34 5- 01 4 VS = ±2.5V G = +1 RL = 2kΩ SHUTDOWN = +2.5V Figure 38. Turn-On Response Time for Various Temperatures (See Figure 49) 0 100 200 300 400 500 600 700 800 0 1 2 3 4 5 6 SU PP LY C U R R EN T (µ A ) TIME (µs) 113 45 -2 58 +125°C +25°C –40°C VS = ±2.5V G = +1 RL = 2kΩ SHUTDOWN = –2.5V Figure 39. Turn-Off Response Time for Various Temperatures (See Figure 50) –0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.9 0.7 0 1 2 3 4 5 6 O U TP U T VO LT A G E (V ) TIME (µs) VS = +2V/–1V VS = ±2.5V VS = ±5V 11 34 5- 24 1 VS = ±2.5V G = +1 RL = 2kΩ SHUTDOWN = +2.5V Figure 40. Turn-On Response Time for Various Supplies (See Figure 49) 0 100 200 300 400 500 600 800 700 0 1 2 3 4 5 6 SU PP LY C U R R EN T (µ A ) TIME (µs) VS = ±1.5V VS = ±5V 11 34 5- 24 2 VS = ±2.5V VS = ±2.5V G = +1 RL = 2kΩ SHUTDOWN = –VS Figure 41. Turn-Off Response Time for Various Supplies (See Figure 50) Rev. B | Page 15 of 25

Page 17

ADA4805-1/ADA4805-2 Data Sheet Rev. B | Page 16 of 25 –160 –140 –120 –100 –80 –60 –40 –20 0 0.001 0.01 0.1 1 10 100 1000 C R O S S TA L K ( d B ) FREQUENCY (MHz) AMP2 TO AMP1 AMP1 TO AMP2 11 34 5- 54 3 Figure 42. Crosstalk vs. Frequency (LFCSP) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 S H U T D O W N T H R E S H O L D ( V ) SUPPLY VOLTAGE FROM GROUND (V) +125°C +25°C –40°C DEVICE ENABLED DEVICE DISABLED 11 34 5- 23 6 Figure 43. SHUTDOWN Threshold vs. Supply Voltage from Ground for Various Temperatures –160 –140 –120 –100 –80 –60 –40 –20 0 0.001 0.01 0.1 1 10 100 1000 C R O S S TA L K ( d B ) FREQUENCY (MHz) AMP2 TO AMP1 AMP1 TO AMP2 11 34 5- 54 4 Figure 44. Crosstalk vs. Frequency (MSOP) 21.5 22.0 22.5 23.0 23.5 24.0 24.5 25.0 25.5 –5 –4 –3 –2 –1 0 1 2 3 0 200 400 600 800 1000 1200 1400 T E M P E R A T U R E ( °C ) C H A N G E I N I N P U T O F F S E T V O LT A G E ( µ V ) TIME (Hours) OIL BATH TEMPERATURE VS = ±2.5V 6 UNITS, SOLDERED TO PCB 11 34 5- 54 2 Figure 45. Long-Term VOS Drift

Page 18

Data Sheet ADA4805-1/ADA4805-2 TEST CIRCUITS 50Ω RS +2.5V –2.5V VOUT 2kΩ CL VIN 20mV p-p 11 34 5- 40 1 Figure 46. Output Capacitive Load Behavior Test Circuit (See Figure 14) 75kΩ +2.5V –2.5V VOUT 11 34 5- 40 2 Figure 47. Current Noise Test Circuit (See Figure 23) +Ib –Ib 113 45 -4 03 Figure 48. Input Bias Current Temperature Test Circuit (See Figure 28) –2.5V 0.5V 5V + – –2.5V SHUTDOWN +2.5V VOUT 2kΩ 11 34 5- 40 4 Figure 49. Turn-On Response Test Circuit (See Figure 38 and Figure 40) –2.5V IS –2.5V SHUTDOWN +2.5V VOUT 2kΩ 1 1 34 5- 40 55V + – Figure 50. Turn-Off Response Test Circuit (See Figure 39 and Figure 41) Rev. B | Page 17 of 25

Page 19

ADA4805-1/ADA4805-2 Data Sheet Rev. B | Page 18 of 25 THEORY OF OPERATION AMPLIFIER DESCRIPTION The ADA4805-1/ADA4805-2 have a bandwidth of 105 MHz and a slew rate of 160 V/μs. They have an input referred voltage noise of only 5.9 nV/√Hz. The ADA4805-1/ADA4805-2 operate over a supply voltage range of 2.7 V to 10 V and consume only 500 μA of supply current at VS = 5 V. The low end of the supply range allows for −10% variation of a 3 V supply. The amplifiers are unity-gain stable, and the input structure results in an extremely low input 1/f noise. The ADA4805-1/ADA4805-2 use a slew enhancement architecture, as shown in Figure 51. The slew enhancement circuit detects the absolute difference between the two inputs. It then modulates the tail current, ITAIL, of the input stage to boost the slew rate. The architecture allows higher slew rate and fast settling time with low quiescent current while maintaining low noise. +IN/+INx VIN+ VIN– VS INPUT STAGE TO DETECT ABSOLUTE VALUE SLEW ENHANCEMENT CIRCUIT ITAIL –IN/−INx 11 34 5- 25 5 Figure 51. Slew Enhancement Circuit INPUT PROTECTION The ADA4805-1/ADA4805-2 are fully protected from ESD events, withstanding human body model ESD events of ±3.5 kV and charged device model events of ±1.25 kV with no measured performance degradation. The precision input is protected with an ESD network between the power supplies and diode clamps across the input device pair, as shown in Figure 52. +IN/+INx ESD ESD –VS +VS BIAS TO THE REST OF THE AMPLIFIER –IN/–INx ESD ESD 11 34 5- 00 5 Figure 52. Input Stage and Protection Diodes For differential voltages above approximately 1.2 V at room temperature, and 0.8 V at 125°C, the diode clamps begin to conduct. If large differential voltages must be sustained across the input terminals, the current through the input clamps must be limited to less than 10 mA. Series input resistors that are sized appropriately for the expected differential overvoltage provide the needed protection. The ESD clamps begin to conduct for input voltages that are more than 0.7 V above the positive supply and input voltages more than 0.7 V below the negative supply. If an overvoltage condition is expected, the input current must be limited to less than 10 mA. SHUTDOWN OPERATION Figure 53 shows the ADA4805-1/ADA4805-2 shutdown circuitry. To maintain very low supply current in shutdown mode, no internal pull-up resistor is supplied; therefore, the SHUTDOWN E pin must be driven high or low externally and not be left floating. Pulling the SHUTDOWN E pin to ≥1 V below midsupply turns the device off, reducing the supply current to 2.9 μA for a 5 V supply. When the amplifier is powered down, its output enters a high impedance state. The output impedance decreases as frequency increases. In shutdown mode, a forward isolation of −62 dB can be achieved at 100 kHz (see Figure 25). +VS –VS SHUTDOWN ESD ESD 2.2R 1.8R 1.1V TO ENABLE AMPLIFIER 11 34 5- 00 6 Figure 53. Shutdown Circuit The SHUTDOWN E pin is protected by ESD clamps, as shown in Figure 53. Voltages beyond the power supplies cause these diodes to conduct. To protect the SHUTDOWN E pin, ensure that the voltage to this pin does not exceed 0.7 V above the positive supply or 0.7 V below the negative supply. If an overvoltage condition is expected, the input current must be limited to less than 10 mA with a series resistor. Table 9 summarizes the threshold voltages for the powered down and enabled modes for various supplies. Table 9. Threshold Voltages for Powered Down and Enabled Modes Mode +3 V +5 V ±5 V +7 V/−2 V Enabled >+1.1 V >+1.9 V >−0.9 V >+1.52 V Powered Down <+0.7 V <+1.5 V <−1.3 V <+1.52 V

Page 20

Data Sheet ADA4805-1/ADA4805-2 NOISE CONSIDERATIONS Figure 54 illustrates the primary noise contributors for the typical gain configurations. The total output noise (vn_out) is the root sum square of all the noise contributions. RG RS in– RF vn 4kTRSvn_RS = 4kTRGvn_RG = vn_RF = + vn_out – 4kTRF 11 34 5- 03 4 in+ Figure 54. Noise Sources in Typical Connection The output noise spectral density is calculated by [ ] 22 2 222 2 _ 4414 FnG G F nSn G F F outn RikTR R R vRikTRs R R kTR v −+ +      +++      ++ = where: k is Boltzmann’s constant. T is the absolute temperature in degrees Kelvin. RF and RG are the feedback network resistances, as shown in Figure 54. RS is the source resistance, as shown in Figure 54. in+ and in− represent the amplifier input current noise spectral density in pA/√Hz. vn is the amplifier input voltage noise spectral density in nV/√Hz. Source resistance noise, amplifier input voltage noise (vn), and the voltage noise from the amplifier input current noise (in+ × RS) are all subject to the noise gain term (1 + RF/RG). Figure 55 shows the total referred to input (RTI) noise due to the amplifier vs. the source resistance. Note that with a 5.9 nV/√Hz input voltage noise and 0.6 pA/√Hz input current noise, the noise contributions of the amplifier are relatively small for source resistances from approximately 2.6 kΩ to 47 kΩ. The Analog Devices silicon germanium (SiGe) bipolar process makes it possible to achieve a low noise of 5.9 nV/√Hz for the ADA4805-1/ADA4805-2. This noise is much improved compared to similar low power amplifiers with a supply current in the range of hundreds of microamperes. 1 10 100 1000 100 1k 10k 100k 1M R TI N O IS E (n V/ √H z) SOURCE RESISTANCE (Ω) TOTAL NOISE SOURCE RESISTANCE NOISE AMPLIFIER NOISE SOURCE RESISTANCE = 2.6kΩ SOURCE RESISTANCE = 47kΩ 11 34 5- 05 1 Figure 55. RTI Noise vs. Source Resistance Rev. B | Page 19 of 25

Page 21

ADA4805-1/ADA4805-2 Data Sheet Rev. B | Page 20 of 25 APPLICATIONS INFORMATION SLEW ENHANCEMENT The ADA4805-1/ADA4805-2 have an internal slew enhancement circuit that increases the slew rate as the feedback error voltage increases. This circuit allows the amplifier to settle a large step response faster, as shown in Figure 56. This is useful in ADC applications where multiple input signals are multiplexed. The impact of the slew enhancement can also be seen in the large signal frequency response, where larger input signals cause a slight increase in peaking, as shown in Figure 57. TIME (ns) O U T P U T V O LT A G E ( V ) 50403020100 10090807060 VOUT = 500mV p-p –0.5 –1.0 –1.5 0.5 0 1.0 1.5 VOUT = 2V p-p VOUT = 1V p-p VS = ±2.5V G = +1 RL = 2kΩ 11 34 5- 25 4 Figure 56. Step Response with Selected Output Steps –6 –5 –4 –3 –2 –1 0 1 2 N O R M A L IZ E D G A IN ( d B ) FREQUENCY (Hz) VS = ±2.5V G = +1 RL = 2kΩ VIN = 400mV p-p VIN = 100mV p-p VIN = 200mV p-p 100k 1M 10M 100M VIN = 632mV p-p VIN = 2V p-p 11 34 5- 10 5 Figure 57. Peaking in Frequency Responses as Signal Level Changes, G = +1 EFFECT OF FEEDBACK RESISTOR ON FREQUENCY RESPONSE The amplifiers input capacitance and feedback resistor form a pole that, for larger value feedback resistors, can reduce phase margin and contribute to peaking in the frequency response. Figure 58 shows the peaking for selected feedback resistors (RF) when the amplifier is configured in a gain of +2. Figure 58 also shows how peaking can be mitigated with the addition of a small value capacitor placed across the feedback resistor of the amplifier. –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 N O R M A L IZ E D G A IN ( d B ) FREQUENCY (Hz) 100k 1M 10M 100M RF = 1kΩ RF = 2.6kΩ RF = 2.6kΩ, CF = 1pF RF = 4.99kΩ RF = 4.99kΩ, CF = 1pF VS = ±2.5V G = +2 RL = 2 kΩ VIN = 200mV p-p 11 34 5- 10 6 Figure 58. Peaking in Frequency Response at Selected RF Values COMPENSATING PEAKING IN LARGE SIGNAL FREQUENCY RESPONSE At high frequency, the slew enhancement circuit can contribute to peaking in the large signal frequency response. Figure 58 shows the effect of a feedback capacitor on the small signal response, whereas Figure 59 shows that the same technique is effective for reducing peaking in the large signal response. –15 –12 –9 –6 –3 0 3 6 N O R M A L IZ E D G A IN ( d B ) FREQUENCY (Hz) VS = ±2.5V G = +2 RL = 2 kΩ VIN = 632mV p-p RF = 2.6kΩ, CF = 0pF RF = 1kΩ, CF = 0pF RF = 2.6kΩ, CF = 2.7pF RF = 1 kΩ, CF = 2 pF 100k 1M 10M 100M 11 34 5- 10 7 Figure 59. Peaking Mitigation in Large Signal Frequency Response DRIVING LOW POWER, HIGH RESOLUTION SUCCESSIVE APPROXIMATION REGISTER (SAR) ADCs The ADA4805-1/ADA4805-2 are ideal for driving low power, high resolution SAR ADCs. The 5.9 nV/√Hz input voltage noise and rail-to-rail output stage of the ADA4805-1/ADA4805-2 help to minimize distortion at large output levels. With its low power of 500 μA, the amplifier consumes power that is compatible with low power SAR ADCs, which are usually in the microwatt (μW) to low milliwatt (mW) range. Furthermore, the ADA4805-1/ADA4805-2 support a single-supply configuration; their input common-mode range extends to 0.1 V below the negative supply, and 1 V below the positive supply.

Page 22

Data Sheet ADA4805-1/ADA4805-2 Rev. B | Page 21 of 25 Figure 60 shows a typical 16-bit, single-supply application. The ADA4805-1/ADA4805-2 drive the AD7980, a 16-bit, 1 MSPS, SAR ADC in a low power configuration. The AD7980 operates on a 2.5 V supply and supports an input from 0 V to VREF. In this case, the ADR435 provides a 5 V reference. The ADA4805-1/ ADA4805-2 are used both as a driver for the AD7980 and as a reference buffer for the ADR435. The low-pass filter formed by R3 and C1 reduces the noise to the input of the ADC (see Figure 60). In lower frequency applications, the designer can reduce the corner frequency of the filter to remove additional noise. AD7980 C2 10µF IN+ IN– GND VDDREF C3 0.1µF C4 100nF VDD C1 2.7nF R3 20Ω +7.5V +7.5V ADA4805-1/ ADA4805-2 ADA4805-1/ ADA4805-2ADR435 5V REF 0V TO VREF 11 34 5- 31 0 Figure 60. Driving the AD7980 with the ADA4805-1/ADA4805-2 In this configuration, the ADA4805-1/ADA4805-2 consume 7.2 mW of quiescent power. The measured signal-to-noise ratio (SNR), total harmonic distortion (THD), and signal-to-noise- and-distortion ratio (SINAD) of the whole system for a 10 kHz signal are 89.4 dB, 104 dBc, and 89.3 dB, respectively. This translates to an effective number of bits (ENOB) of 14.5 at 10 kHz, which is compatible with the AD7980 performance. Table 10 shows the performance of this setup at selected input frequencies. DYNAMIC POWER SCALING One of the merits of a SAR ADC, like the AD7980, is that its power scales with the sampling rate. This power scaling makes SAR ADCs very power efficient, especially when running at a low sampling frequency. However, the ADC driver used with the SAR ADC traditionally consumes constant power regardless of the sampling frequency. Figure 61 illustrates a method by which the quiescent power of the ADC driver can be dynamically scaled with the sampling rate of the system. By providing properly timed signals to the convert start (CNV) pin of the ADC and the SHUTDOWN E pin of the ADA4805-1/ADA4805-2, both devices can be run at optimum efficiency. +5V 2.7nF 20Ω TIMING GENERATOR VIN AD7980 ADA4805-1/ ADA4805-2 REF VDD GND +6V +2.5V 0.1µF CNV 11 34 5- 33 0 Figure 61. ADA4805-1/ADA4805-2/AD7980 Power Management Circuitry Figure 62 illustrates the relative signal timing for power scaling the ADA4805-1/ADA4805-2 and the AD7980. To prevent any degradation in the performance of the ADC, the ADA4805-1/ ADA4805-2 must have a fully settled output into the ADC before the activation of the CNV pin. In this example, the amplifier is switched to full power mode 3 μs prior to the rising edge of the CNV signal. The SHUTDOWN E pin of the ADA4805-1/ADA4805-2 is pulled low when the ADC input is inactive in between samples. The quiescent current of the amplifier typically falls to 10% of the normal operating value within 0.9 μs at VS = 5 V. While in shutdown mode, the ADA4805-1/ADA4805-2 output impedance is high. Table 10. System Performance at Selected Input Frequency for Driving the AD7980 Single-Ended ADC Driver Reference Buffer Results Input Frequency (kHz) Supply (V) Gain Supply (V) Gain SNR (dB) THD (dBc) SINAD (dB) ENOB 1 7.5 1 7.5 1 89.8 103 89.6 14.6 10 7.5 1 7.5 1 89.4 104 89.3 14.5 20 7.5 1 7.5 1 89.9 103 89.7 14.6 50 7.5 1 7.5 1 88.5 99 88.1 14.3 100 7.5 1 7.5 1 86.3 93.7 85.6 13.9

Page 23

ADA4805-1/ADA4805-2 Data Sheet Rev. B | Page 22 of 25 SAMPLING FREQUENCY = 100kHz tS = 10µs ACQUISITION ACQUISITION ACQUISITION SHUTDOWN 3µs 3µs POWERED ON POWERED ON POWERED ON SHUTDOWN SHUTDOWN Vf1 tf1 tTURNOFF1 tf2 Vf2 tTURNOFF2 tAMP, ON Vf3 tf3 tTURNOFF3 ADC MODE CNV ADA4805-1/ ADA4805-2 SHUTDOWN CONVERSION CONVERSION CONVERSION MINIMUM POWERED ON TIME = 3µs 11 34 5- 32 9 ADA4805-1/ ADA4805-2 OUTPUT Figure 62. Timing Waveforms Figure 63 shows the quiescent power of the ADA4805-1/ ADA4805-2 with and without the power scaling. Without power scaling, the ADA4805-1/ADA4805-2 consumes constant power regardless of the sampling frequency, as shown in Equation 1. PQ = IQ × VS (1) With power scaling, the quiescent power becomes proportional to the ratio between the amplifier on time, tAMP, ON, and the sampling time, tS: S ONAMP SQQ t t VIP , (2) Thus, by dynamically switching the ADA4805-1/ADA4805-2 between shutdown and full power modes between consecutive samples, the quiescent power of the driver scales with the sampling rate. 10 100 1000 10000 100000 10 100 1k 10k 100k 1M Q U IE S C E N T P O W E R C O N S U M P T IO N ( µ W ) ADC SAMPLING FREQUENCY (Hz/s) ADA4805-1/ADA4805-2, 6V SINGLE SUPP LY VIN = 4.72V p-p (–0.5dBFS) fIN = 100Hz ON TIME = 3µs 11 34 5- 15 4 ADA4805-1/ADA4805-2 ON TIME = 3µs AD7980 (ADC) ADA4805-1/ADA4805-2 CONTINUOUSLY ON Figure 63. Quiescent Power Consumption of the ADA4805-1/ADA4805-2 vs. ADC Sampling Frequency

Page 24

Data Sheet ADA4805-1/ADA4805-2 Rev. B | Page 23 of 25 SINGLE-ENDED TO DIFFERENTIAL CONVERSION Most high resolution ADCs have differential inputs to reduce common-mode noise and harmonic distortion. Therefore, it is necessary to use an amplifier to convert a single-ended signal into a differential signal to drive the ADCs. There are two common ways the user can convert a single-ended signal into a differential signal: either use a differential amplifier, or configure two amplifiers as shown in Figure 64. The use of a differential amplifier yields better performance, whereas the 2-op-amp solution results in lower system cost. The ADA4805-1/ADA4805-2 solve this dilemma of choosing between the two methods by combining the advantages of both. Their low harmonic distortion, low offset voltage, and low bias current mean that they can produce a differential output that is well matched with the performance of the high resolution ADCs. Figure 64 shows how the ADA4805-1/ADA4805-2 convert a single-ended signal into a differential output. The first amplifier is configured in a gain = +1 with its output then inverted to produce the complementary signal. The differential output then drives the AD7982, an 18-bit, 1 MSPS SAR ADC. To further reduce noise, the user can reduce the values of R1 and R2. However, note that this increases the power consumption. The low-pass filter of the ADC driver limits the noise to the ADC. The measured SNR, THD, and SINAD of the whole system for a 10 kHz signal are 93 dB, 113 dBc, and 93 dB, respectively. This translates to an ENOB of 15.1 at 10 kHz, which is compatible with the performance of the AD7982. Table 11 shows the performance of this setup at selected input frequencies. Table 11. System Performance at Selected Input Frequency for Driving the AD7982 Differentially Results Input Frequency (kHz) SNR (dB) THD (dBc) SINAD (dB) ENOB 1 93 104 93 15.1 10 93 113 93 15.1 20 93 110 93 15.1 50 92 102 91 14.8 100 89 96 88 14.3 LAYOUT CONSIDERATIONS To ensure optimal performance, careful and deliberate attention must be paid to the board layout, signal routing, power supply bypassing, and grounding. Ground Plane It is important to avoid ground in the areas under and around the input and output of the ADA4805-1/ADA4805-2. Stray capacitance between the ground plane and the input and output pads of a device is detrimental to high speed amplifier performance. Stray capacitance at the inverting input, together with the amplifier input capacitance, lowers the phase margin and can cause instability. Stray capacitance at the output creates a pole in the feedback loop, which can reduce phase margin and cause the circuit to become unstable. Power Supply Bypassing Power supply bypassing is a critical aspect in the performance of the ADA4805-1/ADA4805-2. A parallel connection of capacitors from each power supply pin to ground works best. Smaller value ceramic capacitors offer better high frequency response, whereas larger value ceramic capacitors offer better low frequency performance. Paralleling different values and sizes of capacitors helps to ensure that the power supply pins are provided with a low ac impedance across a wide band of frequencies. This is important for minimizing the coupling of noise into the amplifier—especially when the amplifier PSRR begins to roll off—because the bypass capacitors can help lessen the degradation in PSRR performance. Place the smallest value capacitor on the same side of the board as the amplifier and as close as possible to the amplifier power supply pins. Connect the ground end of the capacitor directly to the ground plane. It is recommended that a 0.1 μF ceramic capacitor with a 0508 case size be used. The 0508 case size offers low series inductance and excellent high frequency performance. Place a 10 μF electrolytic capacitor in parallel with the 0.1 μF capacitor. Depending on the circuit parameters, some enhancement to performance can be realized by adding additional capacitors. Each circuit is different and must be analyzed individually for optimal performance. ADA4805-1/ ADA4805-2 ADA4805-1/ ADA4805-2 VIN +7.5V +7.5V +2.5V +2.5V VDD R1 1kΩ R2 1kΩ C2 2.7nF C1 0.1µF C3 2.7nF C4 0.1µF R3 22Ω R4 22Ω AD7982 IN+ IN– REF +5V VDD 11 34 5- 05 3 Figure 64. Driving the AD7982 with the ADA4805-1/ADA4805-2

Page 25

ADA4805-1/ADA4805-2 Data Sheet OUTLINE DIMENSIONS COMPLIANT TO JEDEC STANDARDS MO-178-AB 10° 4° 0° SEATING PLANE 1.90 BSC 0.95 BSC 0.60 BSC 6 5 1 2 3 4 3.00 2.90 2.80 3.00 2.80 2.60 1.70 1.60 1.50 1.30 1.15 0.90 0.15 MAX 0.05 MIN 1.45 MAX 0.95 MIN 0.20 MAX 0.08 MIN 0.50 MAX 0.30 MIN 0.55 0.45 0.35 PIN 1 INDICATOR 12 -1 6- 20 08 -A Figure 65. 6-Lead Small Outline Transistor Package [SOT-23] (RJ-6) Dimensions shown in millimeters 1.30 BSC COMPLIANT TO JEDEC STANDARDS MO-203-AB 1.00 0.90 0.70 0.46 0.36 0.26 2.20 2.00 1.80 2.40 2.10 1.80 1.35 1.25 1.15 07 28 09 -A 0.10 MAX 1.10 0.80 0.40 0.10 0.22 0.08 31 2 46 5 0.65 BSC COPLANARITY 0.10 SEATING PLANE0.30 0.15 Figure 66. 6-Lead Plastic Surface-Mount Package [SC70] (KS-6) Dimensions shown in millimeters Rev. B | Page 24 of 25

ADA4805-2ARMZ Guarantees

Service Guarantee

Service Guarantees

We guarantee 100% customer satisfaction.

Our experienced sales team and tech support team back our services to satisfy all our customers.

Quality Guarantee

Quality Guarantees

We provide 90 days warranty.

If the items you received were not in perfect quality, we would be responsible for your refund or replacement, but the items must be returned in their original condition.

ADA4805-2ARMZ Related Products

hotADA4805-2ARMZ ADM1812-10ARTZ-RL7 Analog Devices Inc., IC MONITOR RESET 4.35V SOT23, TO-236-3, SC-59, SOT-23-3, - View
hotADA4805-2ARMZ ADA4411-3ARQZ-RL Analog Devices Inc., IC HD/FILTER/BUFFER/MUX 24QSOP, 24-SSOP (0.154", 3.90mm Width), - View
hotADA4805-2ARMZ AD627BRZ-RL Analog Devices Inc., IC OPAMP INSTR 80KHZ RRO 8SOIC, 8-SOIC (0.154", 3.90mm Width), - View
hotADA4805-2ARMZ ADA4930-1YCPZ-RL Analog Devices Inc., IC DIFF AMP 1.35GHZ 16-LFCSP, 16-VFQFN Exposed Pad, CSP, - View
hotADA4805-2ARMZ ADA4177-2ARZ-R7 Analog Devices Inc., IC OPAMP 30V PREC OVP EMI 8SOIC, 8-SOIC (0.154", 3.90mm Width), - View
hotADA4805-2ARMZ ADA4638-1ARZ-RL Analog Devices Inc., IC OPAMP ZERO-DRIFT 1.5MHZ 8SOIC, 8-SOIC (0.154", 3.90mm Width), - View
hotADA4805-2ARMZ ADA4862-3YRZ-RL Analog Devices Inc., IC OPAMP CFA 310MHZ 14SOIC, 14-SOIC (0.154", 3.90mm Width), - View
hotADA4805-2ARMZ ADA4096-2WARMZ-R7 Analog Devices Inc., IC OPAMP GP 786KHZ RRO 8MSOP, 8-TSSOP, 8-MSOP (0.118", 3.00mm Width), - View
hotADA4805-2ARMZ ADA4858-3ACPZ-R7 Analog Devices Inc., IC OPAMP CFA 600MHZ 16LFCSP, 16-VQFN Exposed Pad, CSP, - View
hotADA4805-2ARMZ ADA4665-2ARZ-R7 Analog Devices Inc., IC OPAMP GP 1.2MHZ RRO 8SOIC, 8-SOIC (0.154", 3.90mm Width), - View
hotADA4805-2ARMZ ADA4896-2ARMZ-R7 Analog Devices Inc., IC OPAMP VFB 230MHZ RRO 8MSOP, 8-TSSOP, 8-MSOP (0.118", 3.00mm Width), - View
hotADA4805-2ARMZ ADA4897-1ARZ-R7 Analog Devices Inc., IC OPAMP VFB 230MHZ RRO 8SOIC, 8-SOIC (0.154", 3.90mm Width), - View

ADA4805-2ARMZ Tags

  • ADA4805-2ARMZ
  • ADA4805-2ARMZ PDF
  • ADA4805-2ARMZ datasheet
  • ADA4805-2ARMZ specification
  • ADA4805-2ARMZ image
  • Analog Devices Inc.
  • Analog Devices Inc. ADA4805-2ARMZ
  • buy ADA4805-2ARMZ
  • ADA4805-2ARMZ price
  • ADA4805-2ARMZ distributor
  • ADA4805-2ARMZ supplier
  • ADA4805-2ARMZ wholesales

ADA4805-2ARMZ is Available in