GENERAL DESCRIPTION
The AD8479 is a difference amplifier with a very high input common-mode voltage range. The AD8479 is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±600 V.
The AD8479 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±600 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±600 V.
The AD8479 has low offset voltage, low offset voltage drift, low gain drift, low common-mode rejection drift, and excellent common-mode rejection ratio (CMRR) over a wide frequency range.
The AD8479 is available in a space-saving 8-lead SOIC package and is operational over the −40°C to +125°C temperature range.

FEATURES
   ±600 V common-mode voltage range
   Rail-to-rail output
   Fixed gain of 1
   Wide power supply range of ±2.5 V to ±18 V
   550 μA typical power supply current
   Excellent ac specifications
      90 dB minimum CMRR
      130 kHz bandwidth
   High accuracy dc performance
      5 ppm maximum gain nonlinearity
      10 µV/°C maximum offset voltage drift
      5 ppm/°C maximum gain drift

APPLICATIONS
   High voltage current sensing
   Battery cell voltage monitors
   Power supply current monitors
   Motor controls
   Isolation