GENERAL DESCRIPTION

The AD8278 and AD8279 are general-purpose difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. The AD8278 and AD8279 provide exceptional commonmode rejection ratio (80 dB) and high bandwidth while amplifying input signals that are well beyond the supply rails. The on-chip resistors are laser trimmed for excellent gain accuracy and high CMRR. They also have extremely low gain drift vs. temperature.

FEATURES

Wide input range beyond supplies

Rugged input overvoltage protection

Low supply current: 200 μA maximum (per amplifier)

Low power dissipation: 0.5 mW at VS = 2.5 V

Bandwidth: 1 MHz (G = ½)

CMRR: 80 dB minimum, dc to 20 kHz (G = ½, B Grade)

Low offset voltage drift: ±1 μV/°C maximum (B Grade)

Low gain drift: 1 ppm/°C maximum (B Grade)

Enhanced slew rate: 1.4 V/μs

Wide power supply range

Single supply: 2 V to 36 V

Dual supplies: ±2 V to ±18 V

8-lead SOIC, 14-lead SOIC, and 8-lead MSOP packages

APPLICATIONS

Voltage measurement and monitoring

Current measurement and monitoring

Instrumentation amplifier building block

Portable, battery-powered equipment

Test and measurement