GENERAL DESCRIPTION

The AD22057 is a single-supply difference amplifier for amplifying and low-pass filtering small differential voltages (typically 100 mV FS at a gain of 40) from sources having a large common mode voltage.

FEATURES

Gain of 320. Alterable from x1 to x160

Input CMR from Below Ground to 6x (VS – 1 V)

Output Span 20 mV to (VS – 0.2) V

1-, 2-, 3-Pole Low-Pass Filtering Available

Accurate Midscale Offset Capability

Differential Input Resistance 400 kΩ

Drives 1 kV Load to +4 V Using VS = +5 V

Supply Voltage: +3.0 V to +36 V

Transient Spike Protection and RFI Filters Included

Peak Input Voltage (40 ms): 60 V

Reversed Supply Protection: –34 V

Operating Temperature Range: –40°C to +125°C

APPLICATIONS

Current Sensing

Motor Control

Interface for Pressure Transducers, Position Indicators,

Strain Gages, and Other Low Level Signal Sources

Accelerometers