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AD637SD/883B

hotAD637SD/883B

AD637SD/883B

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Part Number AD637SD/883B
Manufacturer Analog Devices Inc.
Description IC RMS/DC CONV PRECISION 14CDIP
Datasheet AD637SD/883B Datasheet
Package 14-CDIP (0.300", 7.62mm)
In Stock 939 piece(s)
Unit Price $ 122.8000 *
Lead Time Can Ship Immediately
Estimated Delivery Time Sep 21 - Sep 26 (Choose Expedited Shipping)
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Part Number # AD637SD/883B (PMIC - RMS to DC Converters) 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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AD637SD/883B Specifications

ManufacturerAnalog Devices Inc.
CategoryIntegrated Circuits (ICs) - PMIC - RMS to DC Converters
Datasheet AD637SD/883BDatasheet
Package14-CDIP (0.300", 7.62mm)
Series-
Current - Supply2.2mA
Voltage - Supply��3 V ~ 18 V
Mounting TypeThrough Hole
Package / Case14-CDIP (0.300", 7.62mm)
Supplier Device Package14-CDIP

AD637SD/883B Datasheet

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High Precision, Wideband RMS-to-DC Converter Data Sheet AD637 FEATURES High accuracy 0.02% maximum nonlinearity, 0 V to 2 V rms input 0.1% additional error to crest factor of 3 Wide bandwidth 8 MHz at 2 V rms input 600 kHz at 100 mV rms Computes True rms Square Mean square Absolute value dB output (60 dB range) Chip select/power-down feature allows Analog three-state operation Quiescent current reduction from 2.2 mA to 350 µA FUNCTIONAL BLOCK DIAGRAM 00 78 8- 00 1 VIN 25kΩ 25kΩ ABSOLUTE VALUE DEN INPUT CAV RMS OUT BUFF IN BUFF OUT SQUARER/ DIVIDER BIAS COMMON CS OUTPUT OFFSET dB OUTPUT – + + – – + Figure 1. GENERAL DESCRIPTION The AD637 is a complete, high accuracy, rms-to-dc converter that computes the true rms value of any complex waveform. It offers performance that is unprecedented in integrated circuit rms-to-dc converters and comparable to discrete and modular techniques in accuracy, bandwidth, and dynamic range. The AD637 computes the true root mean square, mean square, or absolute value of any complex ac (or ac plus dc) input waveform and gives an equivalent dc output voltage. The true rms value of a waveform is more useful than an average rectified signal because it relates directly to the power of the signal. The rms value of a statistical signal relates to the standard deviation of the signal. Superior crest factor compensation permits measurements of signals with crest factors of up to 10 with less than 1% additional error. The wide bandwidth of the AD637 permits the measurement of signals up to 600 kHz with inputs of 200 mV rms and up to 8 MHz when the input levels are above 1 V rms. Direct dB value of the rms output with a range of 60 dB is available on a separate pin. An externally programmed reference current allows the user to select the 0 dB reference voltage to correspond to any level between 0.1 V and 2.0 V rms. A chip select connection on the AD637 permits the user to decrease the supply current from 2.2 mA to 350 µA during periods when the rms function is not in use. This feature facilitates the addition of precision rms measurement to remote or handheld applications where minimum power consumption is critical. In addition, when the AD637 is powered down, the output goes to a high impedance state. This allows several AD637s to be tied together to form a wideband true rms multiplexer. The input circuitry of the AD637 is protected from overload voltages in excess of the supply levels. The inputs are not damaged by input signals if the supply voltages are lost. The AD637 is laser wafer trimmed to achieve rated performance without external trimming. The only external component required is a capacitor that sets the averaging period. The value of this capacitor also determines low frequency accuracy, ripple level, and settling time. The on-chip buffer amplifier is used either as an input buffer or in an active filter configuration. The filter can be used to reduce the amount of ac ripple, thereby increasing accuracy. The AD637 is available in accuracy Grade J and Grade K for commercial temperature range (0°C to 70°C) applications, accuracy Grade A and Grade B for industrial range (−40°C to +85°C) appli- cations, and accuracy Grade S rated over the −55°C to +125°C temperature range. All versions are available in hermetically sealed, 14-lead SBDIP, 14-lead CERDIP, and 16-lead SOIC_W packages. Rev. L 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 ©2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

Page 3

AD637 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 3 Specifications ..................................................................................... 4 Absolute Maximum Ratings .......................................................... 10 ESD Caution ................................................................................ 10 Pin Configurations and Function Descriptions ......................... 11 Theory of Operation ...................................................................... 12 Applications Information .............................................................. 13 Standard Connection ................................................................. 13 Chip Select ................................................................................... 13 Optional Trims for High Accuracy .......................................... 13 Offset Trim .............................................................................. 14 Scale Factor Trim ................................................................... 14 Choosing the Averaging Time Constant ................................. 14 Frequency Response .................................................................. 16 AC Measurement Accuracy and Crest Factor ........................ 17 Connection for dB Output ........................................................ 17 dB Calibration ............................................................................. 18 Low Frequency Measurements ................................................. 19 Vector Summation ..................................................................... 19 Evaluation Board ............................................................................ 21 Outline Dimensions ....................................................................... 24 Ordering Guide .......................................................................... 25 Rev. L | Page 2 of 25

Page 4

Data Sheet AD637 REVISION HISTORY 4/15—Rev. K to Rev. L Changes to Features Section, Figure 1, and General Description Section ................................................................................................ 1 Changes to Table 1 ............................................................................ 4 Added Table 2; Renumbered Sequentially ..................................... 6 Added Table 3 .................................................................................... 8 Changed Pin NC to Pin NIC (Throughout) ................................ 11 Changes to Theory of Operation Section and Figure 4 ............. 12 Changes to Figure 5......................................................................... 13 Changes to Optional Trims for High Accuracy Section and Figure 8; Added Offset Trim Section and Scale Factor Trim Section ............................................................................................... 14 Changes to Choosing the Averaging Time Constant and Figure 11 ........................................................................................... 15 Changes to Figure 20 ...................................................................... 19 Changes to Figure 21 ...................................................................... 20 Changes to Ordering Guide ........................................................... 26 2/11—Rev. J to Rev. K Changes to Figure 15 ...................................................................... 11 Changes to Figure 16 ...................................................................... 12 Changes to Evaluation Board Section and Figure 23 ................. 16 Added Figure 24; Renumbered Sequentially ............................... 17 Changes to Figure 25 Through Figure 29 .................................... 17 Changes to Figure 30 ...................................................................... 18 Added Figure 31 .............................................................................. 18 Deleted Table 6; Renumbered Sequentially ................................. 18 Changes to Ordering Guide ........................................................... 20 4/07—Rev. I to Rev. J Added Evaluation Board Section .................................................. 16 Updated Outline Dimensions ........................................................ 20 10/06—Rev. H to Rev. I Changes to Table 1 ............................................................................ 3 Changes to Figure 4 .......................................................................... 7 Changes to Figure 7 .......................................................................... 9 Changes to Figure 16, Figure 18, and Figure 19 .......................... 12 Changes to Figure 20 ...................................................................... 13 12/05—Rev. G to Rev. H Updated Format ................................................................. Universal Changes to Figure 1 .......................................................................... 1 Changes to Figure 11 ...................................................................... 10 Updated Outline Dimensions........................................................ 16 Changes to Ordering Guide ........................................................... 17 4/05—Rev. F to Rev. G Updated Format ................................................................. Universal Changes to Figure 1 .......................................................................... 1 Changes to General Description ..................................................... 1 Deleted Product Highlights ............................................................. 1 Moved Figure 4 to Page .................................................................... 8 Changes to Figure 5 .......................................................................... 9 Changes to Figure 8 ........................................................................ 10 Changes to Figure 11, Figure 12, Figure 13, and Figure 14 ....... 11 Changes to Figure 19 ...................................................................... 14 Changes to Figure 20 ...................................................................... 14 Changes to Figure 21 ...................................................................... 16 Updated Outline Dimensions........................................................ 17 Changes to Ordering Guide ........................................................... 18 3/02—Rev. E to Rev. F Edits to Ordering Guide ................................................................... 3 Rev. L | Page 3 of 25

Page 5

AD637 Data Sheet Rev. L | Page 4 of 25 SPECIFICATIONS At 25°C, test frequency = 1 kHz, VIN units are VRMS, VS = ±15 V dc, unless otherwise noted. Table 1. Parameter Test Conditions/Comments AD637J/AD637A Unit Min Typ Max TRANSFER FUNCTION VOUT = 2IN )(V avg  CONVERSION ACCURACY Total Error, Internal Trim See Figure 5 ±1 ± 0.5 mV rms ±% of reading TMIN to TMAX ±3.0 ± 0.6 mV ± % of reading vs. Supply VIN = 300 mV 30 150 μV/V VIN = −300 mV 100 300 μV/V DC Reversal −2 V < VIN < +2 V 0.25 % of reading Nonlinearity 2 V full scale 0.04 % of FSR 7 V full scale 0.05 % of FSR Total Error External trim ±0.5 ± 0.1 mV ± % of reading ERROR VS. CREST FACTOR (CF) Additional, at 1 V rms CF, % For CF = 1 to 2 Specified accuracy For CF = 3 ±0.1 % of reading For CF = 10 ±1.0 % of reading AVERAGING TIME CONSTANT 25 ms/μF CAV INPUT CHARACTERISTICS Signal Range VS = ±15 V Continuous 0 to 7 V rms Transient ±15 V p-p VS = ±5 V Continuous 0 to 4 V rms Transient ±6 V p-p Input Resistance 6.4 8 9.6 kΩ Input Offset Voltage ±0.5 mV FREQUENCY RESPONSE Bandwidth for 1% (0.09 dB) Additional Error VIN = 20 mV 11 kHz VIN = 200 mV 66 kHz VIN = 2 V 200 kHz ±3 dB VIN = 20 mV 150 kHz VIN = 200 mV 1 MHz VIN = 2 V 8 MHz OUTPUT CHARACTERISTICS Offset Voltage ±1 mV vs. temperature ±0.05 ±0.089 mV/°C Voltage Swing, 2 kΩ load 0 to 12.0 13.5 V VS = ±3 V 0 to 2 2.2 V Output Current 6 mA Short-Circuit Current 20 mA Resistance CS high 0.5 Ω Resistance CS low 100 kΩ

Page 6

Data Sheet AD637 Parameter Test Conditions/Comments AD637J/AD637A Unit Min Typ Max dB OUTPUT Error VIN = 7 mV to 7 V rms, 0 dBV ±0.5 dBV Scale Factor −3 mV/dB Scale Factor Tempco +0.33 % of reading/°C −0.033 dB/°C IREF for 0 dB = 1 V rms 5 20 80 µA IREF Range 1 100 µA BUFFER AMPLIFIER Input Output Voltage Range −VS to (+VS − 2.5) V Input Offset Voltage ±0.8 ±2 mV Input Current ±2 ±10 nA Input Resistance 108 Ω Output Current −0.13 +5 mA Short-Circuit Current 20 mA Small Signal Bandwidth 1 MHz Slew Rate 2 kΩ load, to −VS 5 V/µs DENOMINATOR INPUT Input Range 0 to 10 V Input Resistance 20 25 30 kΩ Offset Voltage ±0.2 ±0.5 mV CHIP SELECT (CS) RMS On Level Open or 2.4 < VC < +VS V RMS Off Level VC < 0.2 VC < 0.2 V IOUT of Chip Select CS low 10 µA CS high 0 µA On Time Constant 10 + ((25 kΩ) × CAV) µs Off Time Constant 10 + ((25 kΩ) × CAV) µs POWER SUPPLY Operating Voltage Range ±3.0 ±18 V Quiescent Current 2.2 3 mA Standby Current 350 450 µA Rev. L | Page 5 of 25

Page 7

AD637 Data Sheet Rev. L | Page 6 of 25 Table 2. Parameter Test Conditions/Comments AD637K/AD637B Unit Min Typ Max TRANSFER FUNCTION VOUT = 2IN )(V avg  CONVERSION ACCURACY Total Error, Internal Trim See Figure 5 ±0.5 ± 0.2 mV rms ±% of reading TMIN to TMAX ±2.0 ± 0.3 mV ± % of reading vs. Supply VIN = 300 mV 30 150 μV/V VIN = −300 mV 100 300 μV/V DC Reversal −2 V < VIN < +2 V 0.1 % of reading Nonlinearity 2 V full scale 0.02 % of FSR 7 V full scale 0.05 % of FSR Total Error External trim ±0.25 ± 0.05 mV ± % of reading ERROR VS. CREST FACTOR (CF) Additional, at 1 V rms CF, % For CF = 1 to 2 Specified accuracy For CF = 3 ±0.1 % of reading For CF = 10 ±1.0 % of reading AVERAGING TIME CONSTANT 25 ms/μF CAV INPUT CHARACTERISTICS Signal Range VS = ±15 V Continuous 0 to 7 V rms Transient ±15 V p-p VS = ±5 V Continuous 0 to 4 V rms Transient ±6 V p-p Input Resistance 6.4 8 9.6 kΩ Input Offset Voltage ±0.2 mV FREQUENCY RESPONSE Bandwidth for 1% (0.09 dB) Additional Error VIN = 20 mV 11 kHz VIN = 200 mV 66 kHz VIN = 2 V 200 kHz ±3 dB VIN = 20 mV 150 kHz VIN = 200 mV 1 MHz VIN = 2 V 8 MHz OUTPUT CHARACTERISTICS Offset Voltage ±0.5 mV vs. temperature ±0.04 ±0.056 mV/°C Voltage Swing, 2 kΩ load 0 to 12.0 13.5 V VS = ±3 V 0 to 2 2.2 V Output Current 6 mA Short-Circuit Current 20 mA Resistance CS high 0.5 Ω Resistance CS low 100 kΩ dB OUTPUT Error VIN = 7 mV to 7 V rms, 0 dBV ±0.3 dBV Scale Factor −3 mV/dB Scale Factor Tempco +0.33 % of reading/°C −0.033 dB/°C IREF for 0 dB = 1 V rms 5 20 80 μA IREF Range 1 100 μA

Page 8

Data Sheet AD637 Rev. L | Page 7 of 25 Parameter Test Conditions/Comments AD637K/AD637B Unit Min Typ Max BUFFER AMPLIFIER Input Output Voltage Range −VS to (+VS − 2.5) V Input Offset Voltage ±0.5 ±1 mV Input Current ±2 ±5 nA Input Resistance 108 Ω Output Current −0.13 +5 mA Short-Circuit Current 20 mA Small Signal Bandwidth 1 MHz Slew Rate 2 kΩ load, to −VS 5 V/μs DENOMINATOR INPUT Input Range 0 to 10 V Input Resistance 20 25 30 kΩ Offset Voltage ±0.2 ±0.5 mV CHIP SELECT (CS) RMS On Level Open or 2.4 < VC < +VS V RMS Off Level VC < 0.2 V IOUT of Chip Select CS low 10 μA CS high 0 μA On Time Constant 10 + ((25 kΩ) × CAV) μs Off Time Constant 10 + ((25 kΩ) × CAV) μs POWER SUPPLY Operating Voltage Range ±3.0 ±18 V Quiescent Current 2.2 3 mA Standby Current 350 450 μA

Page 9

AD637 Data Sheet Rev. L | Page 8 of 25 Table 3. Parameter Test Conditions/Comments AD637S Unit Min Typ Max TRANSFER FUNCTION VOUT = 2IN )(V avg  CONVERSION ACCURACY Total Error, Internal Trim See Figure 5 ±1 ± 0.5 mV rms ±% of reading TMIN to TMAX ±6 ± 0.7 mV ± % of reading vs. Supply VIN = 300 mV 30 150 μV/V VIN = −300 mV 100 300 μV/V DC Reversal −2 V < VIN < +2 V 0.25 % of reading Nonlinearity 2 V full scale 0.04 % of FSR 7 V full scale 0.05 % of FSR Total Error External trim ±0.5 ± 0.1 mV ± % of reading ERROR VS. CREST FACTOR (CF) Additional, at 1 V rms CF, % For CF = 1 to 2 Specified accuracy For CF = 3 ±0.1 % of reading For CF = 10 ±1.0 % of reading AVERAGING TIME CONSTANT 25 ms/μF CAV INPUT CHARACTERISTICS Signal Range VS = ±15 V Continuous 0 to 7 V rms Transient ±15 V p-p VS = ±5 V Continuous 0 to 4 V rms Transient ±6 V p-p Input Resistance 6.4 8 9.6 kΩ Input Offset Voltage ±0.5 mV FREQUENCY RESPONSE Bandwidth for 1% (0.09 dB) Additional Error VIN = 20 mV 11 kHz VIN = 200 mV 66 kHz VIN = 2 V 200 kHz ±3 dB VIN = 20 mV 150 kHz VIN = 200 mV 1 MHz VIN = 2 V 8 MHz OUTPUT CHARACTERISTICS Offset Voltage ±1 mV vs. temperature ±0.04 ±0.07 mV/°C Voltage Swing, 2 kΩ load 0 to 12.0 13.5 V VS = ±3 V 0 to 2 2.2 V Output Current 6 mA Short-Circuit Current 20 mA Resistance CS high 0.5 Ω Resistance CS low 100 kΩ dB OUTPUT Error VIN = 7 mV to 7 V rms, 0 dBV ±0.5 dBV Scale Factor −3 mV/dB Scale Factor Tempco +0.33 % of reading/°C −0.033 dB/°C IREF for 0 dB = 1 V rms 5 20 80 μA IREF Range 1 100 μA

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Data Sheet AD637 Rev. L | Page 9 of 25 Parameter Test Conditions/Comments AD637S Unit Min Typ Max BUFFER AMPLIFIER Input Output Voltage Range −VS to (+VS − 2.5) V Input Offset Voltage ±0.8 ±2 mV Input Current ±2 ±10 nA Input Resistance 108 Ω Output Current −0.13 +5 mA Short-Circuit Current 20 mA Small Signal Bandwidth 1 MHz Slew Rate 2 kΩ load, to −VS 5 V/μs DENOMINATOR INPUT Input Range 0 to 10 V Input Resistance 20 25 30 kΩ Offset Voltage ±0.2 ±0.5 mV CHIP SELECT (CS) RMS On Level Open or 2.4 < VC < +VS V RMS Off Level V IOUT of Chip Select CS low 10 μA CS high 0 μA On Time Constant 10 + ((25 kΩ) × CAV) μs Off Time Constant 10 + ((25 kΩ) × CAV) μs POWER SUPPLY Operating Voltage Range ±3.0 ±18 V Quiescent Current 2.2 3 mA Standby Current 350 450 μA

AD637SD/883B Reviews

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Amani*****reras

August 17, 2020

It fit exactly in the same location as the original. Works great and no problem. Good purchase.

Tre*****Morar

August 12, 2020

To be honest, you're beating your competitor on delivery - sometimes I request 2nd day and you still get it here overnight. Thanks!

Grace*****Franco

August 8, 2020

This product is very easy to replace and solved my problem.

Dann*****rdin

August 6, 2020

So far so good. I need to see how they hold up.

Geor*****ndra

August 6, 2020

It gives you a good quality product, with a great variety.. I will for sure order this set again when i start to run low.

Dari*****hields

July 28, 2020

They work great and I hope to find more used for the extra ones.

Nath***** Borah

July 25, 2020

I like doing business with Heisener. Get all the items I want. The website is well organized, intuitive, works correctly and pages load quickly. Well done!

Jewe*****chard

July 18, 2020

A good, reputable company that I will continue to deal with, thank you!

Esth*****ayer

July 16, 2020

Great item and excellent seller! Would highly recommend. Thank you. Trustworthy

Cel*****Date

July 6, 2020

Wow super fast delivery, product as described good company!

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