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AD521:  Integrated Circuit Precision Instrumentation Amplifier

Product Details

Newer Alternatives:
  • AD620: Low Drift, Low Power Instrumentation Amp with Set Gains of 1 to 10000 or AD8221: A gain programmable high performance precision Instrumentation Amp

The AD521 is a second generation, low cost monolithic IC instrumentation amplifier developed by Analog Devices. As a true instrumentation amplifier, the AD521 is a gain block with differential inputs and an accurately programmable input/output gain relationship.

The AD521 IC instrumentation amplifier is available in four different versions of accuracy and operating temperature range. The economical "J" grade, the low drift "K" grade, and the lower drift, high linearity "L" grade are specified from 0 to +70°C. The "S" grade guarantees performance to specification over the extended temperature range: -55°C to +125°C.


  • Programmable gains from 0.1 to 1000
  • Differential inputs
  • High CMRR: 110 dB min
  • Low drift: 2 µV/°C max (L)
  • Complete input protection, Power ON and Power OFF
  • Functionally complete with the addition of two resistors
  • Internally compensated
  • Gain bandwidth product: 40 MHz
  • Output current limited: 25 mA
  • Very low noise: 0.5 µV p-p, 0.1 Hz to 10 Hz, RTI @ G = 1000
  • Chips are available

Of Note ...



Title Content Type File Type
AD521: Integrated Circuit Precision Instrumentation Amplifier Data Sheet (Rev A, 01/1999) (pdf, 2148 kB) Data Sheets 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
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

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.

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Price, packaging, availability

AD521 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD521JDZ Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $37.32 $33.74 Y  Material Info PCN Purchase
AD521KDZ Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $50.73 $45.85 Y  Material Info PCN Purchase
AD521LDZ Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $81.02 $73.23 Y  Material Info PCN Purchase
AD521SD/883B Status: Production 14 ld Bottom-Brazed CerDIP 14 Mil Tube, 25 $98.24 $88.81 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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