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AD625:  Programmable Gain Instrumentation Amplifier

Product Details


The AD625 is a precision instrumentation amplifier specifically designed to fulfill two major areas of application: 1) Circuits requiring nonstandard gains (i.e., gains not easily achievable with devices such as the AD524 and AD624). 2) Circuits requiring a low cost, precision software programmable gain amplifier.

For low noise, high CMRR, and low drift the AD625JN is the most cost effective instrumentation amplifier solution available. An additional three resistors allow the user to set any gain from 1 to 10,000. The error contribution of the AD625JN is less than 0.05% gain error and under 5 ppm/°C gain TC; performance limitations are primarily determined by the external resistors. Common-mode rejection is independent of the feedback resistor matching.

A software programmable gain amplifier (SPGA) can be configured with the addition of a CMOS multiplexer (or other switch network), and a suitable resistor network. Because the ON resistance of the switches is removed from the signal path, an AD625 based SPGA will deliver 12-bit precision, and can be programmed for any set of gains between 1 and 10,000, with completely user selected gain steps.

For the highest precision the AD625C offers an input offset voltage drift of less than 0.25 µV/°C, output offset drift below 15 µV/°C, and a maximum nonlinearity of 0.001% at G = 1. All grades exhibit excellent ac performance; a 25 MHz gain bandwidth product, 5 V/µs slew rate and 15 µs settling time.

The AD625 is available in three accuracy grades (A, B, C) for industrial (-40°C to +85°C) temperature range, two grades (J, K) for commercial (0°C to +70°C) temperature range, and one (S) grade rated over the extended (-55°C to +125°C) temperature range.

FEATURES and BENEFITS

  • User Programmed Gains of 1 to 10,000
  • Low Gain Error: 0.02% Max
  • Low Gain TC: 5 ppm/°C Max
  • Low Nonlinearity: 0.001% Max
  • Low Offset Voltage: 25 µV
  • Low Noise 4 nV/√Hz (at 1 kHz) RTI
  • MIL-Standard Parts Available
  • Gain Bandwidth Product: 25 MHz
  • 16-Lead Ceramic or Plastic DIP
    Package, 20-Terminal LCC Package
  • Standard Military Drawing Available
  • Low Cost

Functional Block Diagram for AD625

Documentation

Title Content Type File Type
AD625: Programmable Gain Instrumentation Amplifier Data Sheet  (Rev D, 06/2000) (pdf, 463 kB) Data Sheets PDF
AD625: Military Data Sheet  (Rev C, 05/2000) (pdf) 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
ADI Warns Against Misuse of COTS Integrated Circuits  (pdf, 13 kB)
(Revised 1/03)
Invites Customer Participation in Creative Mil/Aero System Solutions
Recommended Reading PDF
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
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information 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
In-Amp Error Calculator
These tools will help estimate error contributions in your instrumentation amplifier circuit. It uses input parameters such as temperature, gain, voltage input, and source impedance to determine the errors that can contribute to your overall design.
Design Calculators 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

AD625 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
5962-87719012A Status: Production LCC:CER LEADLESS CHIP CARR 20 Mil Tube, 54 $182.85 $165.30 N  Material Info PCN Purchase
5962-8771901EA Status: Production 16 ld Side-Brazed CerDip 16 Mil Tube, 23 $64.43 $58.24 N  Material Info PCN Purchase
AD625ADZ Status: Production 16 ld Side-Brazed CerDip 16 Ind Tube, 23 $24.21 $21.92 Y  Material Info PCN Purchase
AD625BDZ Status: Production 16 ld Side-Brazed CerDip 16 Ind Tube, 23 $30.71 $27.75 Y  Material Info PCN Purchase
AD625CDZ Status: Production 16 ld Side-Brazed CerDip 16 Ind Tube, 23 $44.01 $39.77 Y  Material Info PCN Purchase
AD625JNZ Status: Production 16 ld PDIP 16 Comm. Tube, 25 $10.42 $9.41 Y  Material Info PCN Purchase
AD625KNZ Status: Production 16 ld PDIP 16 Comm. Tube, 25 $14.77 $13.36 Y  Material Info PCN Purchase
AD625SD Status: Production 16 ld Side-Brazed CerDip 16 Mil Tube, 23 $54.73 $49.49 N  Material Info PCN Purchase
AD625SD/883B Status: Production 16 ld Side-Brazed CerDip 16 Mil Tube, 23 $64.43 $58.24 N  Material Info PCN Purchase
AD625SE/883B Status: Production LCC:CER LEADLESS CHIP CARR 20 Mil Tube, 54 $158.31 $143.10 N  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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