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AD8421ARMZ-R7

AD8421ARMZ-R7

AD8421ARMZ-R7

For Reference Only

Part Number AD8421ARMZ-R7
Manufacturer Analog Devices Inc.
Description IC OPAMP INSTR 10MHZ 8MSOP
Datasheet AD8421ARMZ-R7 Datasheet
Package 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
In Stock 1,875 piece(s)
Unit Price $ 3.4160 *
Lead Time To be Confirmed
Estimated Delivery Time Jan 30 - Feb 4 (Choose Expedited Shipping)
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Part Number # AD8421ARMZ-R7 (Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps) is manufactured by Analog Devices Inc. and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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AD8421ARMZ-R7 Specifications

ManufacturerAnalog Devices Inc.
CategoryIntegrated Circuits (ICs) - Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Datasheet AD8421ARMZ-R7Datasheet
Package8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Series-
Amplifier TypeInstrumentation
Number of Circuits1
Output Type-
Slew Rate35 V/µs
Gain Bandwidth Product-
-3db Bandwidth10MHz
Current - Input Bias1nA
Voltage - Input Offset60µV
Current - Supply2mA
Current - Output / Channel65mA
Voltage - Supply, Single/Dual (±)5 V ~ 36 V, ��2.5 V ~ 18 V
Operating Temperature-40°C ~ 85°C
Mounting TypeSurface Mount
Package / Case8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package8-MSOP

AD8421ARMZ-R7 Datasheet

Page 1

Page 2

3 nV/√Hz, Low Power Instrumentation Amplifier Data Sheet AD8421 Rev. 0 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 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved. FEATURES Low power 2.3 mA maximum supply current Low noise 3.2 nV/√Hz maximum input voltage noise at 1 kHz 200 fA/√Hz current noise at 1 kHz Excellent ac specifications 10 MHz bandwidth (G = 1) 2 MHz bandwidth (G = 100) 0.6 μs settling time to 0.001% (G = 10) 80 dB CMRR at 20 kHz (G = 1) 35 V/μs slew rate High precision dc performance (AD8421BRZ) 94 dB CMRR minimum (G = 1) 0.2 μV/°C maximum input offset voltage drift 1 ppm/°C maximum gain drift (G = 1) 500 pA maximum input bias current Inputs protected to 40 V from opposite supply ±2.5 V to ±18 V dual supply (5 V to 36 V single supply) Gain set with a single resistor (G = 1 to 10,000) APPLICATIONS Medical instrumentation Precision data acquisition Microphone preamplification Vibration analysis Multiplexed input applications ADC driver PIN CONNECTION DIAGRAM TOP VIEW (Not to Scale) –IN 1 RG 2 RG 3 +IN 4 +VS8 VOUT7 REF6 –VS5 AD8421 1 01 2 3 -0 01 Figure 1. 10µ 1n 100 1M T O T A L N O IS E D E N S IT Y A T 1 kH z (V /√ H z) SOURCE RESISTANCE, RS (Ω) 10 1 2 3 -0 7 8 1µ 100n 10n 1k 10k 100k G = 100 AD8421 BEST AVAILABLE 1mA LOW POWER IN-AMP BEST AVAILABLE 7mA LOW NOISE IN-AMP RS NOISE ONLY Figure 2. Noise Density vs. Source Resistance GENERAL DESCRIPTION The AD8421 is a low cost, low power, extremely low noise, ultralow bias current, high speed instrumentation amplifier that is ideally suited for a broad spectrum of signal conditioning and data acquisition applications. This product features extremely high CMRR, allowing it to extract low level signals in the presence of high frequency common-mode noise over a wide temperature range. The 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling time to 0.001% (G = 10) allow the AD8421 to amplify high speed signals and excel in applications that require high channel count, multiplexed systems. Even at higher gains, the current feedback architecture maintains high performance; for example, at G = 100, the bandwidth is 2 MHz and the settling time is 0.8 μs. The AD8421 has excellent distortion performance, making it suitable for use in demanding applications such as vibration analysis. The AD8421 delivers 3 nV/√Hz input voltage noise and 200 fA/√Hz current noise with only 2 mA quiescent current, making it an ideal choice for measuring low level signals. For applications with high source impedance, the AD8421 employs innovative process technology and design techniques to provide noise performance that is limited only by the sensor. The AD8421 uses unique protection methods to ensure robust inputs while still maintaining very low noise. This protection allows input voltages up to 40 V from the opposite supply rail without damage to the part. A single resistor sets the gain from 1 to 10,000. The reference pin can be used to apply a precise offset to the output voltage. The AD8421 is specified from −40°C to +85°C and has typical performance curves to 125°C. It is available in 8-lead MSOP and SOIC packages.

Page 3

AD8421 Data Sheet Rev. 0 | Page 2 of 28 TABLE OF CONTENTS Features .............................................................................................. 1  Applications....................................................................................... 1  Pin Connection Diagram ................................................................ 1  General Description ......................................................................... 1  Revision History ............................................................................... 2  Specifications..................................................................................... 3  AR and BR Grades........................................................................ 3  ARM and BRM Grades................................................................ 5  Absolute Maximum Ratings............................................................ 8  Thermal Resistance ...................................................................... 8  ESD Caution.................................................................................. 8  Pin Configuration and Function Descriptions............................. 9  Typical Performance Characteristics ........................................... 10  Theory of Operation ...................................................................... 20  Architecture................................................................................. 20  Gain Selection............................................................................. 20  Reference Terminal .................................................................... 21  Input Voltage Range................................................................... 21  Layout .......................................................................................... 21  Input Bias Current Return Path ............................................... 22  Input Voltages Beyond the Supply Rails.................................. 22  Radio Frequency Interference (RFI)........................................ 23  Calculating the Noise of the Input Stage................................. 23  Applications Information .............................................................. 25  Differential Output Configuration .......................................... 25  Driving an ADC ......................................................................... 26  Outline Dimensions ....................................................................... 27  Ordering Guide .......................................................................... 27  REVISION HISTORY 5/12—Revision 0: Initial Version

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Data Sheet AD8421 Rev. 0 | Page 3 of 28 SPECIFICATIONS VS = ±15 V, VREF = 0 V, TA = 25°C, G = 1, RL = 2 kΩ, unless otherwise noted. AR AND BR GRADES Table 1. AR Grade BR Grade Parameter Test Conditions/ Comments Min Typ Max Min Typ Max Unit COMMON-MODE REJECTION RATIO (CMRR) CMRR DC to 60 Hz with 1 kΩ Source Imbalance VCM = −10 V to +10 V G = 1 86 94 dB G = 10 106 114 dB G = 100 126 134 dB G = 1000 136 140 dB Over Temperature, G = 1 T = −40°C to +85°C 80 93 dB CMRR at 20 kHz VCM = −10 V to +10 V G = 1 80 80 dB G = 10 90 100 dB G = 100 100 110 dB G = 1000 110 120 dB NOISE Voltage Noise, 1 kHz1 VIN+, VIN− = 0 V Input Voltage Noise, eni 3 3.2 3 3.2 nV/√Hz Output Voltage Noise, eno 60 60 nV/√Hz Peak to Peak, RTI f = 0.1 Hz to 10 Hz G = 1 2 2 2.2 μV p-p G = 10 0.5 0.5 μV p-p G = 100 to 1000 0.07 0.07 0.09 μV p-p Current Noise Spectral Density f = 1 kHz 200 200 fA/√Hz Peak to Peak, RTI f = 0.1 Hz to 10 Hz 18 18 pA p-p VOLTAGE OFFSET2 Input Offset Voltage, VOSI VS = ±5 V to ±15 V 60 25 μV Over Temperature TA = −40°C to +85°C 86 45 μV Average TC 0.4 0.2 μV/°C Output Offset Voltage, VOSO 350 250 μV Over Temperature TA = −40°C to +85°C 0.66 0.45 mV Average TC 6 5 μV/°C Offset RTI vs. Supply (PSR) VS = ±2.5 V to ±18 V G = 1 90 120 100 120 dB G = 10 110 120 120 140 dB G = 100 124 130 140 150 dB G = 1000 130 140 140 150 dB INPUT CURRENT Input Bias Current 1 2 0.1 0.5 nA Over Temperature TA = −40°C to +85°C 8 6 nA Average TC 50 50 pA/°C Input Offset Current 0.5 2 0.1 0.5 nA Over Temperature TA = −40°C to +85°C 2.2 0.8 nA Average TC 1 1 pA/°C

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AD8421 Data Sheet Rev. 0 | Page 4 of 28 AR Grade BR Grade Parameter Test Conditions/ Comments Min Typ Max Min Typ Max Unit DYNAMIC RESPONSE Small Signal Bandwidth −3 dB G = 1 10 10 MHz G = 10 10 10 MHz G = 100 2 2 MHz G = 1000 0.2 0.2 MHz Settling Time to 0.01% 10 V step G = 1 0.7 0.7 μs G = 10 0.4 0.4 μs G = 100 0.6 0.6 μs G = 1000 5 5 μs Settling Time to 0.001% 10 V step G = 1 1 1 μs G = 10 0.6 0.6 μs G = 100 0.8 0.8 μs G = 1000 6 6 μs Slew Rate G = 1 to 100 35 35 V/μs GAIN3 G = 1 + (9.9 kΩ/RG) Gain Range 1 10,000 1 10,000 V/V Gain Error VOUT = ±10 V G = 1 0.02 0.01 % G = 10 to 1000 0.2 0.1 % Gain Nonlinearity VOUT = −10 V to +10 V G = 1 RL ≥ 2 kΩ 1 1 ppm RL = 600 Ω 1 3 1 3 ppm G = 10 to 1000 RL ≥ 600 Ω 30 50 30 50 ppm VOUT = −5 V to +5 V 5 10 5 10 ppm Gain vs. Temperature3 G = 1 5 0.1 1 ppm/°C G > 1 −50 −50 ppm/°C INPUT Input Impedance Differential 30||3 30||3 GΩ||pF Common Mode 30||3 30||3 GΩ||pF Input Operating Voltage Range4 VS = ±2.5 V to ±18 V −VS + 2.3 +VS − 1.8 −VS + 2.3 +VS − 1.8 V Over Temperature TA = −40°C −VS + 2.5 +VS − 2.0 −VS + 2.5 +VS − 2.0 V TA = +85°C −VS + 2.1 +VS − 1.8 −VS + 2.1 +VS − 1.8 V OUTPUT RL = 2 kΩ Output Swing VS = ±2.5 V to ±18 V −VS + 1.2 +Vs − 1.6 −VS + 1.2 +VS − 1.6 V Over Temperature TA = −40°C to +85°C −VS + 1.2 +Vs − 1.6 −VS + 1.2 +VS − 1.6 V Short-Circuit Current 65 65 mA REFERENCE INPUT RIN 20 20 kΩ IIN VIN+, VIN− = 0 V 20 24 20 24 μA Voltage Range −VS +VS −VS +VS V Reference Gain to Output 1 ± 0.0001 1 ± 0.0001 V/V

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Data Sheet AD8421 Rev. 0 | Page 5 of 28 AR Grade BR Grade Parameter Test Conditions/ Comments Min Typ Max Min Typ Max Unit POWER SUPPLY Operating Range Dual supply ±2.5 ±18 ±2.5 ±18 V Single supply 5 36 5 36 V Quiescent Current 2 2.3 2 2.3 mA Over Temperature TA = −40°C to +85°C 2.6 2.6 mA TEMPERATURE RANGE For Specified Performance −40 +85 −40 +85 °C Operational5 −40 +125 −40 +125 °C 1 Total voltage noise = √(eni2 + (eno/G)2 + eRG2). See the Th section for more information. eory of Operation 2 Total RTI VOS = (VOSI) + (VOSO/G). 3 These specifications do not include the tolerance of the external gain setting resistor, RG. For G > 1, add RG errors to the specifications given in this table. 4 Input voltage range of the AD8421 input stage only. The input range can depend on the common-mode voltage, differential voltage, gain, and reference voltage. See the section for more details. Input Voltage Range 5 See the section for expected operation between 85°C and 125°C. Typical Performance Characteristics ARM AND BRM GRADES Table 2. ARM Grade BRM Grade Parameter Test Conditions/ Comments Min Typ Max Min Typ Max Unit COMMON-MODE REJECTION RATIO (CMRR) CMRR DC to 60 Hz with 1 kΩ Source Imbalance VCM = −10 V to +10 V G = 1 84 92 dB G = 10 104 112 dB G = 100 124 132 dB G = 1000 134 140 dB Over Temperature, G = 1 TA = −40°C to +85°C 80 90 dB CMRR at 20 kHz VCM = −10 V to +10 V G = 1 80 80 dB G = 10 90 90 dB G = 100 100 100 dB G = 1000 100 100 dB NOISE Voltage Noise, 1 kHz1 VIN+, VIN− = 0 V Input Voltage Noise, eni 3 3.2 3 3.2 nV/√Hz Output Voltage Noise, eno 60 60 nV/√Hz Peak to Peak, RTI f = 0.1 Hz to 10 Hz G = 1 2 2 2.2 μV p-p G = 10 0.5 0.5 μV p-p G = 100 to 1000 0.07 0.07 0.09 μV p-p Current Noise Spectral Density f = 1 kHz 200 200 fA/√Hz Peak to Peak, RTI f = 0.1 Hz to 10 Hz 18 18 pA p-p VOLTAGE OFFSET2 Input Offset Voltage, VOSI VS = ±5 V to ±15 V 70 50 μV Over Temperature TA = −40°C to +85°C 135 135 μV Average TC 0.9 0.9 μV/°C Output Offset Voltage, VOSO 600 400 μV Over Temperature TA = −40°C to +85°C 1 1 mV Average TC 9 9 μV/°C

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AD8421 Data Sheet Rev. 0 | Page 6 of 28 ARM Grade BRM Grade Parameter Test Conditions/ Comments Min Typ Max Min Typ Max Unit Offset RTI vs. Supply (PSR) VS = ±2.5 V to ±18 V G = 1 90 120 100 120 dB G = 10 110 120 120 140 dB G = 100 124 130 140 150 dB G = 1000 130 140 140 150 dB INPUT CURRENT Input Bias Current 1 2 0.1 1 nA Over Temperature TA = −40°C to +85°C 8 6 nA Average TC 50 50 pA/°C Input Offset Current 0.5 2 0.1 1 nA Over Temperature TA = −40°C to +85°C 3 1.5 nA Average TC 1 1 pA/°C DYNAMIC RESPONSE Small Signal Bandwidth −3 dB G = 1 10 10 MHz G = 10 10 10 MHz G = 100 2 2 MHz G = 1000 0.2 0.2 MHz Settling Time 0.01% 10 V step G = 1 0.7 0.7 μs G = 10 0.4 0.4 μs G = 100 0.6 0.6 μs G = 1000 5 5 μs Settling Time 0.001% 10 V step G = 1 1 1 μs G = 10 0.6 0.6 μs G = 100 0.8 0.8 μs G = 1000 6 6 μs Slew Rate G = 1 to 100 35 35 V/μs GAIN3 G = 1 + (9.9 kΩ/RG) Gain Range 1 10,000 1 10,000 V/V Gain Error VOUT = ±10 V G = 1 0.05 0.02 % G = 10 to 1000 0.3 0.2 % Gain Nonlinearity VOUT = −10 V to +10 V G = 1 RL ≥ 2 kΩ 1 1 ppm RL = 600 Ω 1 3 1 3 ppm G = 10 to 1000 RL ≥ 600 Ω 30 50 30 50 ppm VOUT = −5 V to +5 V 5 10 5 10 ppm Gain vs. Temperature3 G = 1 5 0.1 1 ppm/°C G > 1 −50 −50 ppm/°C INPUT Input Impedance Differential 30||3 30||3 GΩ||pF Common Mode 30||3 30||3 GΩ||pF Input Operating Voltage Range4 VS = ±2.5 V to ±18 V −VS + 2.3 +VS − 1.8 −VS + 2.3 +VS − 1.8 V Over Temperature TA = −40°C −VS + 2.5 +VS − 2.0 −VS + 2.5 +VS − 2.0 V TA = +85°C −VS + 2.1 +VS − 1.8 −VS + 2.1 +VS − 1.8 V

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Data Sheet AD8421 Rev. 0 | Page 7 of 28 ARM Grade BRM Grade Parameter Test Conditions/ Comments Min Typ Max Min Typ Max Unit OUTPUT RL = 2 kΩ Output Swing VS = ±2.5 V to ±18 V −VS + 1.2 +VS − 1.6 −VS + 1.2 +Vs − 1.6 V Over Temperature TA = −40°C to +85°C −VS + 1.2 +VS − 1.6 −VS + 1.2 +Vs − 1.6 V Short-Circuit Current 65 65 mA REFERENCE INPUT RIN 20 20 kΩ IIN VIN+, VIN− = 0 V 20 24 20 24 μA Voltage Range −VS +VS −VS +VS V Reference Gain to Output 1 ± 0.0001 1 ± 0.0001 V/V POWER SUPPLY Operating Range Dual supply ±2.5 ±18 ±2.5 ±18 V Single supply 5 36 5 36 V Quiescent Current 2 2.3 2 2.3 mA Over Temperature TA = −40°C to +85°C 2.6 2.6 mA TEMPERATURE RANGE For Specified Performance −40 +85 −40 +85 °C Operational5 −40 +125 −40 +125 °C 1 Total voltage noise = √(eni2 + (eno/G)2 + eRG2). See the Th section for more information. eory of Operation 2 Total RTI VOS = (VOSI) + (VOSO/G). 3 These specifications do not include the tolerance of the external gain setting resistor, RG. For G > 1, add RG errors to the specifications given in this table. 4 Input voltage range of the AD8421 input stage only. The input range can depend on the common-mode voltage, differential voltage, gain, and reference voltage. See the section for more information. Input Voltage Range 5 See the section for expected operation between 85°C and 125°C. Typical Performance Characteristics

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AD8421 Data Sheet Rev. 0 | Page 8 of 28 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Rating Supply Voltage ±18 V Output Short-Circuit Current Duration Indefinite Maximum Voltage at −IN or +IN1 −VS + 40 V Minimum Voltage at −IN or +IN +VS − 40 V Maximum Voltage at REF2 +VS + 0.3 V Minimum Voltage at REF −VS − 0.3 V Storage Temperature Range −65°C to +150°C Operating Temperature Range −40°C to +125°C Maximum Junction Temperature 150°C ESD Human Body Model 2 kV Charged Device Model 1.25 kV Machine Model 0.2 kV 1 For voltages beyond these limits, use input protection resistors. See the Theory of Operation section for more information. 2 There are ESD protection diodes from the reference input to each supply, so REF cannot be driven beyond the supplies in the same way that +IN and −IN can. See the Reference Terminal section for more information. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL RESISTANCE θJA is specified for a device in free air using a 4-layer JEDEC printed circuit board (PCB). Table 4. Package θJA Unit 8-Lead SOIC 107.8 °C/W 8-Lead MSOP 138.6 °C/W ESD CAUTION

Page 10

Data Sheet AD8421 Rev. 0 | Page 9 of 28 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TOP VIEW (Not to Scale) –IN 1 RG 2 RG 3 +IN 4 +VS8 VOUT7 REF6 –VS5 AD8421 1 01 2 3 -0 02 Figure 3. Pin Configuration Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 −IN Negative Input Terminal. 2, 3 RG Gain Setting Terminals. Place resistor across the RG pins to set the gain. G = 1 + (9.9 kΩ/RG). 4 +IN Positive Input Terminal. 5 −VS Negative Power Supply Terminal. 6 REF Reference Voltage Terminal. Drive this terminal with a low impedance voltage source to level shift the output. 7 VOUT Output Terminal. 8 +VS Positive Power Supply Terminal.

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