AD629

PRODUCTION

AD629

High Common-Mode Voltage, Difference Amplifier

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Features

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

Additional 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

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

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Part Models 9

1ku List Price Starting From $4.52

Technical Documents 11

AD629: High Common-Mode Voltage, Difference Amplifier Data Sheet (Rev.C) 09/28/2006

AN-244: A User's Guide to I.C. Instrumentation Amplifiers 11/23/2004

AN-589: Ways to Optimize the Performance of a Difference Amplifier (Rev.B) 02/14/2015

AN-671: Reducing RFI Rectification Errors in In-Amp Circuits (Rev.0) 11/23/2004

AN-245: Instrumentation Amplifiers Solve Unusual Design Problems 11/23/2004

AN-1531: Measuring −48 V High-Side Current Using the AD629 Difference Amplifier, AD8603 Op Amp, AD780 Reference, and AD7453 12-Bit ADC Single-Supply Components (Rev.a) 12/18/2017

The AD8221 - Setting a New Industry Standard for Instrumentation Amplifiers 01/01/2000

Input Filter Prevents Instrumentation-amp RF-Rectification Errors 11/13/2003

High-Voltage Monitor Features High Accuracy 08/19/2002

High-performance Adder Uses Instrumentation Amplifiers 09/03/2009

Simple Discrete SE-to-Differential Precision In-Amp Circuit: High Common-Mode Input Range and 50% Less Power 10/01/2016

Reference Materials 3

CN-0240: Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection 06/13/2012

A Designer's Guide to Instrumentation Amplifiers, 3rd Edition, 2006 01/02/2006

Finding the Needle in a Haystack: Measuring small differential voltages in the presence of large common-mode voltages 01/01/2000

Design Resources 9

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
AD629AC-WP	None Available	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629ANZ	8-Lead PDIP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629ARZ	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629ARZ-R7	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629ARZ-RL	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629BNZ	8-Lead PDIP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629BRZ	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629BRZ-R7	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD629BRZ-RL	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys