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