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Description

The AD8420 is a low cost, micropower, wide supply range, instrumentation amplifier with a rail-to-rail output and a novel architecture that allows for extremely flexible design. It is optimized to amplify small differential voltages in the presence of large common-mode signals. The AD8420 is based on an indirect current feedback architecturethat gives it an excellent input common-mode range. Unlike conventional instrumentation amplifiers, the device can easily amplify signals at or even slightly below ground without requiring dual supplies. The IC has rail-to-rail output, and the output voltage swing is completely independent of the input common mode voltage.

Features

1. Maximum supply current: 80 μA
2. Minimum CMRR: 100 dB
3. Drives heavy capacitive loads: ~700 pF
4. Rail-to-rail output
5. Input voltage range goes below ground
6. Gain set with 2 external resistors
7. Can achieve low gain drift at any gain
8. Very wide power supply range

Applications 

1. Bridge amplifiers
2. Pressure measurement
3. Medical instrumentation
4. Portable data acquisition
5. Multichannel systems