AD628

PRODUCTION

AD628

High Common-Mode Voltage, Programmable Gain Difference Amplifier

PRODUCTION

Not the part you were looking for?

Go to Product Selection Table

View All Documentation

Ask a Question

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

Other places you can find help

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

Sales & Ordering FAQs

Part Models 6

1ku List Price Starting From $2.59

Features

High common-mode input voltage range
±120 V at V_S = ±15 V
Gain range 0.1 to 100
Operating temperature range:
−40°C to +85°C
Supply voltage range
Dual supply: ±2.25 V to ±18 V
Single supply: 4.5 V to 36 V
Excellent ac and dc performance
Offset temperature stability RTI: 10 μV/°C maximum
Offset: ±1.5 V mV maximum
CMRR RTI: 75 dB minimum, dc to 500 Hz,
G = +1

Additional Details

The AD628 is a precision difference amplifier that combines excellent dc performance with high common-mode rejection over a wide range of frequencies. When used to scale high voltages, it allows simple conversion of standard control voltages or currents for use with single-supply ADCs. A wideband feedback loop minimizes distortion effects due to capacitor charging of Σ-Δ ADCs.

A reference pin (V_REF) provides a dc offset for converting bipolar to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA input signals to a single-ended output within the input range of single-supply ADCs.

The AD628 has an input common mode and differential mode operating range of ±120 V. The high common mode, input impedance makes the device well suited for high voltage measurements across a shunt resistor. The inverting input of the buffer amplifier is available for making a remote Kelvin connection.

A precision 10 kΩ resistor connected to an external pin is provided for either a low-pass filter or to attenuate large differential input signals. A single capacitor implements a low-pass filter. The AD628 operates from single and dual supplies and is available in an 8-lead SOIC_N or an 8-lead MSOP. It operates over the standard industrial temperature range of −40°C to +85°C.

Applications

High voltage current shunt sensing
Programmable logic controllers
Analog input front end signal conditioning
+5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA
Isolation Sensor signal conditioning
Power supply monitoring
Electrohydraulic controls
Motor controls

View All Documentation

Ask a Question

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

Other places you can find help

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

Sales & Ordering FAQs

Part Models 6

1ku List Price Starting From $2.59

Technical Documents 14

AD628: High Common-Mode Voltage, Programmable Gain Difference Amplifier Data Sheet (Rev.G) 11/01/2002

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

AN-669: Effectively Applying the AD628 Precision Gain Block (Rev.0) 02/14/2015

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-282: Fundamentals of Sampled Data Systems 02/14/2015

Auto-Zero Amplifiers 03/01/2010

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

Simple circuit provides precision ADC interface 08/21/2003

Single IC provides gains of 10 and –10 08/07/2003

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

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

FAQ 06/17/2015

Reference Materials 2

CN-0190: Robust, Multivoltage, High Efficiency, 25 W Universal Power Supply Module with 6 V to 14 V Input 09/20/2011

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

Design Resources 6

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
AD628ARMZ	8-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD628ARMZ-R7	8-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD628ARMZ-RL	8-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD628ARZ	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD628ARZ-R7	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD628ARZ-RL	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys