GENERAL DESCRIPTION

The AD8657/AD8659 are dual and quad micropower, precision, rail-to-rail input/output amplifiers optimized for low power and wide operating supply voltage range applications.

The AD8657/AD8659 operate from 2.7 V to 18 V with a typical quiescent supply current of 18 μA. The devices use the Analog Devices, Inc., patented DigiTrim® trimming technique, which achieves low offset voltage. The AD8657/AD8659 also have high immunity to electromagnetic interference.

The combination of low supply current, low offset voltage, very low input bias current, wide supply range, and rail-to-rail input and output make the AD8657/AD8659 ideal for current monitoring in process and motor control applications. The combination of precision specifications makes these devices ideal for dc gain and buffering of sensor front ends or high impedance input sources in wireless or remote sensors or transmitters.

FEATURES

Micropower at high voltage (18 V): 22 μA maximum

Low offset voltage: 350 µV maximum

Low input bias current: 20 pA maximum

Gain bandwidth product: 230 kHz at AV = 100 typical

Unity-gain crossover: 230 kHz

−3 dB closed-loop bandwidth: 305 kHz

Single-supply operation: 2.7 V to 18 V

Dual-supply operation: ±1.35 V to ±9 V

Unity-gain stable

Excellent electromagnetic interference immunity

APPLICATIONS

Portable operating systems

Current monitors

4 mA to 20 mA loop drivers

Buffer/level shifting

Multipole filters

Remote/wireless sensors

Low power transimpedance amplifiers