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AD8231:  Zero Drift, Digitally Programmable Instrumentation Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8231 is a low drift, rail-to-rail, instrumentation amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128. The gains are programmed via digital logic or pin strapping.

The AD8231 is ideal for applications that require precision performance over a wide temperature range, such as industrial temperature sensing and data logging. Because the gain setting resistors are internal, maximum gain drift is only 10 ppm/°C for gains of 1 to 32. Because of the auto-zero input stage, maximum input offset is 15 μV and maximum input offset drift is just 50 nV/°C. CMRR is 80 dB for G = 1, increasing to 110 dB at higher gains.

The AD8231 also includes an uncommitted op amp that can be used for additional gain, differential signal driving, or filtering. Like the in-amp, the op amp has an auto-zero architecture, rail-to-rail input, and rail-to-rail output.

The AD8231 includes a shutdown feature that reduces current to a maximum of 1 μA. In shutdown, both amplifiers also have a high output impedance, which allows easy multiplexing of multiple amplifiers without additional switches.

The AD8231 is specified over the extended industrial tempera-ture range of −40°C to +125°C. It is available in a 4 mm × 4 mm 16-lead LFCSP.

Applications
  • Pressure and strain transducers
  • Thermocouples and RTDs
  • Programmable instrumentation
  • Industrial controls
  • Weigh scales

FEATURES and BENEFITS

  • Digitally/pin-programmable gain
    G = 1, 2, 4, 8, 16, 32, 64, or 128
  • Specified from −40°C to +125°C
    50 nV/°C maximum input offset drift
    10 ppm/°C maximum gain drift
  • Excellent dc performance
    80 dB minimum CMR, G = 1
    15 μV maximum input offset voltage
    500 pA maximum bias current
    0.7 μV p-p noise (0.1 Hz to 10 Hz)
  • Good ac performance
    2.7 MHz bandwidth, G = 1
    1.1 V/μs slew rate
  • Rail-to-rail output
  • Shutdown/multiplex
  • See data sheet for additional features

AD8231-EP Supports defense and aerospace applications (AQEC standard)

  • Download AD8231-EP Data Sheet (pdf)
  • Military temperature range
    (−55°C to +125°C)
  • Controlled manufacturing baseline
  • One assembly/test site
  • One fabrication site
  • Enhanced product change notification
  • Qualification data available on request
  • V62/12646 DSCC Drawing Number

Functional Block Diagram for AD8231

Additional Information

For additional ADI Healthcare Products and related information, please visit www.analog.com/healthcare.

Documentation

Title Content Type File Type
AD8231: Zero Drift, Digitally Programmable Instrumentation Amplifier Data Sheet (Rev B, 04/2011) (pdf, 679 kB) Data Sheets 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
In-amp Sports Near-zero Drift & Input Noise, Wide Bandwidth and Temp Range, Plus a "Free" Op Amp
(Planet Analog, 1/19/2007)
Product Reviews HTML
Zero-Drift Amplifiers  (pdf, 0) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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

AD8231 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8231ACPZ-R7 Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 - $1.71 Y  Material Info PCN Purchase Sample
AD8231ACPZ-RL Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 5000 - $1.71 Y  Material Info PCN Purchase
AD8231ACPZ-WP Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Tray, 64 $2.14 $1.71 Y  Material Info PCN Purchase
AD8231TCPZ-EP-R7 Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Mil Reel, 1500 $6.21 $4.96 Y  Material Info PCN Purchase
AD8231WACPZ-RL Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 5000 - $2.14 Y  Material Info Notify Me 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.

AD8231 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8231-EVALZ Status: Production Evaluation Board $70.79 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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