GENERAL DESCRIPTION

The AD8217 is a high voltage, high-resolution current shunt amplifier. It features a set gain of 20 V/V, with a maximum ±0.35% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. The AD8217 offers excellent common-mode rejection from 4.5 V to 80 V, and includes an internal LDO, which directly powers the device from the high voltage rail. Therefore, no additional supply is necessary, provided that the input common-mode range is 4.5 V to 80 V. The AD8217 performs unidirectional current measurements across a shunt resistor in a variety of industrial and telecom applications including motor control, battery management, and base station power amplifier bias control.

FEATURES

  High common-mode voltage range

    4.5 V to 80 V operating

    0 V to 85 V survival

  Buffered output voltage

  Wide operating temperature range: −40°C to +125°C

  Excellent ac and dc performance

    ±100 nV/°C typical offset drift

    ±100 µV/°C typical offset

    ±5 ppm/°C typical gain drift

    100 dB typical CMRR at dc

APPLICATIONS

  High side current sensing

    48 V telecom

    Power management

    Base stations

    Unidirectional motor control

    Precision high voltage current sources