GENERAL DESCRIPTION
The AD8231-EP 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-EP 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.

FEATURES
   Digitally/pin-programmable gain
      G = 1, 2, 4, 8, 16, 32, 64, or 128
   Specified from −55°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
   Extra op amp
   Single-supply range: 3 V to 6 V
   Dual-supply range: ±1.5 V to ±3 V

ENHANCED PRODUCT FEATURES
   Supports defense and aerospace applications (AQEC
      standard)
   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