GENERAL DESCRIPTION

This family of amplifiers has ultralow offset, drift, and bias current. The AD8571, AD8572, and AD8574 are single, dual, and quad amplifiers, respectively, featuring rail-to-rail input and output swings. All are guaranteed to operate from 2.7 V to 5 V single supply.

The AD857x family provides benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc. topology, these zero-drift amplifiers combine low cost with high accuracy. (No external capacitors are required.) Using a patented spread-spectrum, auto-zero technique, the AD857x family eliminates the intermodulation effects from interaction of the chopping function with the signal frequency in ac applications.

FEATURES

  Low offset voltage: 1 μV

  Input offset drift: 0.005 μV/°C

  Rail-to-rail input and output swing

  5 V/2.7 V single-supply operation

  High gain: 145 dB typical

  CMRR: 140 dB typical

  PSRR: 130 dB typical

  Ultralow input bias current: 10 pA typical

  Low supply current: 750 μA/op amp

  Overload recovery time: 50 μs

  No external capacitors required

APPLICATIONS

  Temperature sensors

  Pressure sensors

  Precision current sensing

  Strain gage amplifiers

  Medical instrumentation

  Thermocouple amplifiers