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AD629:  High Common-Mode Voltage, Difference Amplifier

Product Details


The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V.

The AD629 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±270 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±500 V.

The AD629 has low offset, low offset drift, low gain error drift, low common-mode rejection drift, and excellent CMRR over a wide frequency range.

The AD629 is available in low cost, 8-lead PDIP and 8-lead SOIC packages. For all packages (including die) and grades, performance is guaranteed over the industrial temperature range of −40°C to +85°C.

Applications

  • High voltage current sensing
  • Battery cell voltage monitors
  • Power supply current monitors
  • Motor controls
  • Isolation

FEATURES and BENEFITS

  • Improved replacement for: INA117P and INA117KU
  • ±270 V common-mode voltage range
  • Input protection to
    ±500 V common mode
    ±500 V differential mode
    Wide power supply range (±2.5 V to ±18 V)
    ±10 V output swing on ±12 V supply
    1 mA maximum power supply current
  • HIGH ACCURACY DC PERFORMANCE
    3 ppm maximum gain nonlinearity (AD629B)
    20 μV/°C maximum offset drift (AD629A)
    10 μV/°C maximum offset drift (AD629B)
    10 ppm/°C maximum gain drift
  • EXCELLENT AC SPECIFICATIONS
    77 dB minimum CMRR @ 500 Hz (AD629A)
    86 dB minimum CMRR @ 500 Hz (AD629B)
    500 kHz bandwidth

Functional Block Diagram for AD629

Documentation

Title Content Type File Type
AD629: High Common-Mode Voltage, Difference Amplifier Data Sheet  (Rev C, 04/2011) (pdf, 534 kB) Data Sheets PDF
AN-244: A User's Guide to I.C. Instrumentation Amplifiers  (pdf, 522 kB) Application Notes PDF
AN-245: Instrumentation Amplifiers Solve Unusual Design Problems  (pdf, 543 kB)
Traditionally Considered Only for Transducer-Conditioning Applications, Instrumentation Amplifiers Bring Unique Performance Benefits to a Range of Other Applications as Well.
Application Notes PDF
AN-671: Reducing RFI Rectification Errors in In-Amp Circuits  (pdf, 208 kB) Application Notes PDF
AN-589: Ways to Optimize the Performance of a Difference Amplifier  (pdf, 115 kB)
This Application Note presents several ways to build and optimize the performance of a discrete difference amplifier. It also recommends amplifiers that will make the overall solution cost/performance competitive with monolithic instrument amplifiers.
Application Notes PDF
CN-0240: Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection  (pdf, 336 kB) Circuit Note PDF
CN-0100: Measuring −48 V High-Side Current Using the AD629 Difference Amplifier, AD8603 Op Amp, AD780 Reference, and AD7453 12-Bit ADC Single-Supply Components  (pdf, 108 kB) Circuit Note PDF
A Designer's Guide to Instrumentation Amplifiers (3rd Edition) Design Handbooks HTML
Finding the Needle in a Haystack: Measuring small differential voltages in the presence of large common-mode voltages
(Analog Dialogue, Vol. 34, No. 1, January-February, 2000)
Analog Dialogue HTML
Auto-Zero Amplifiers  (doc, 75 kB)
A wide variety of electronic applications, especially those involving very small input signals, require signal paths with very low offset voltage and offset voltage drift over time and temperature.
Technical Articles DOC
High-performance Adder Uses Instrumentation Amplifiers
Make an adder circuit using instrumentation amplifiers to increase input impedance.
(EDN, 9/3/2009)
Technical Articles HTML
Input Filter Prevents Instrumentation-amp RF-Rectification Errors
by Charles Kitchin, Lew Counts, and Moshe Gerstenhaber, Analog Devices, Inc. (EDN, 11/13/2003)
Technical Articles HTML
High-Voltage Monitor Features High Accuracy
... Article is on page 3 of PDF.
(Electronic Design, Ideas for Design, 8/19/2002)
Technical Articles HTML
The AD8221 - Setting a New Industry Standard for Instrumentation Amplifiers  (pdf, 582 kB) Technical Articles PDF
Applying Instrumentation Amplifiers Effectively: The Importance of an Input Ground Return  (pdf, 508 kB) Technical Documentation PDF
Leading Inside Advertorials: Applying Instrumentation Amplifiers Effectively–The Importance of an Input Ground Return  (pdf, 121 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

AD629 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD629AC-WP Status: Production CHIPS OR DIE 0 Ind Tray, 165 - - Y  Material Info Notify Me Contact ADI
AD629ANZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $3.59 $3.05 Y  Material Info PCN Purchase
AD629AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.86 $3.29 N  Material Info PCN Purchase
AD629AR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $3.29 N  Material Info PCN Purchase
AD629AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $3.29 N  Material Info PCN Purchase
AD629ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.42 $2.90 Y  Material Info PCN Purchase
AD629ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.90 Y  Material Info PCN Purchase
AD629ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.90 Y  Material Info PCN Purchase
AD629BNZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $5.54 $4.69 Y  Material Info PCN Purchase
AD629BR Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.96 $5.05 N  Material Info PCN Purchase
AD629BR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $5.05 N  Material Info PCN Purchase
AD629BR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $5.05 N  Material Info PCN Purchase
AD629BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $5.28 $4.47 Y  Material Info PCN Purchase
AD629BRZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $4.47 Y  Material Info PCN Purchase
AD629BRZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $4.47 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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