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AD626:  Low Cost, Single-Supply Differential Amplifier

Product Details

Newer Alternatives:
  • AD8276 or the AD8278 difference amps for their faster speed, smaller foot print, wider supply voltage range, and lower costs.

The AD626 is a low cost, true single supply differential amplifier designed for amplifying and low-pass filtering small differential voltages from sources having a large common-mode voltage.

The AD626 can operate from either a single supply of +2.4 V to +10 V, or dual supplies of ±1.2 V to ±6 V. The input common-mode range of this amplifier is equal to 6 (+VS - 1 V) which provides a +24 V CMR while operating from a +5 V supply. Furthermore, the AD626 features a CMR of 90 dB typ.

The amplifier's inputs are protected against continuous overload of up to 50 V, and RFI filters are included in the attenuator network. The output range is +0.03 V to +4.9 V using a +5 V supply. The amplifier provides a preset gain of 10, but gains between 10 to 100 can be easily configured with an external resistor. Furthermore, a gain of 100 is available by connecting the G = 100 pin to analog ground. The AD626 also offers low-pass filter capability by connecting a capacitor between the filter pin and analog ground.

The AD626A and AD626B operate over the industrial temperature range of -40°C to +85°C. The AD626 is available in two 8-pin packages: a plastic mini-DIP and SOIC.


  • Pin Selectable Gains of 10 and 100
  • True Single-Supply Operation
    - Single-Supply Range of +2.4V to +10V
    - Dual-Supply Range of ±1.2V to ±6V
    - Wide Output Voltage Range of 30 mV to 4.7V
  • Includes Input Protection
    - Series Resistive Inputs (RIN = 200 kΩ)
    - RFI Filters Included
    - Allows 50V Continuous Overload
  • Optional Low-Pass Filtering
  • Excellent DC Performance
    - Low Input Offset Voltage: 500 µV Max
    - Large Common-Mode Range: 0V to +54V
    - Low Power: 1.2 mW (VS = +5V)
    - Good CMR of 90 dB Typ
  • AC Performance
    - Fast Settling Time: 24 µs (0.01%)

Pin Configuration Diagram for AD626


Title Content Type File Type
AD626: Low Cost, Single Supply Differential Amplifier Data Sheet (Rev D, 01/2003) (pdf, 366 kB) Data Sheets PDF
AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes 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
A Designer's Guide to Instrumentation Amplifiers (3rd Edition) Design Handbooks 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
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

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD626 SPICE Macro-Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD626 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD626ANZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $4.40 $3.96 Y  Material Info PCN Purchase
AD626AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $4.73 $4.27 N  Material Info PCN Purchase
AD626AR-REEL Status: Last Time Buy 8 ld SOIC 8 Ind Reel, 2500 - $4.27 N  Material Info PCN/PDN Purchase
AD626AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 - $4.27 N  Material Info PCN Purchase
AD626ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $4.19 $3.77 Y  Material Info PCN Purchase
AD626ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $3.77 Y  Material Info PCN Purchase
AD626ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 - $3.77 Y  Material Info PCN Purchase
AD626BNZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $6.01 $5.43 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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