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AD8231 Datasheet

AD8231 Datasheet

Zero Drift, Digitally Programmable Instrumentation Amplifier
Part No.: AD8231
Page: 23 Pages
Size: 2131 KB
Manufacturer: Analog Devices, Inc.
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Update Time: 2023-12-22 14:26:43
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AD8231 Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
AD8231ACPZ-R7 Reel 1500   3 16 -40°C ~ 125°C 16-Lead LFCSP (4 mm × 4 mm × 0.75 w/ EP)  
AD8231ACPZ-RL Reel 5000   3 16 -40°C ~ 125°C 16-Lead LFCSP (4 mm × 4 mm × 0.75 w/ EP)  
AD8231ACPZ-WP WafflePack 64   3 16 -40°C ~ 125°C 16-Lead LFCSP (4 mm × 4 mm × 0.75 w/ EP)  
AD8231WACPZ-RL Reel 5000   3 16 -40°C ~ 125°C 16-Lead LFCSP (4 mm × 4 mm w/ EP)  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

AD8231 Datasheet(PDF)

AD8231 Datasheet(Picture)

AD8231 Features

  • 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)
  • See data sheet for additional features

AD8231 Applications

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

AD8231 Description

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.

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