The AD8221 precision instrumentation amplifier is an easy-to-use instrumentation amplifier with a gain range of 1 to 1000, available in a space-saving MSOP package. It offers excellent AC specifications, low noise, and high accuracy dc performance.
The AD8221 is a gain‑programmable precision instrumentation amplifier offering very high CMRR and low noise performance. It is designed for applications such as weigh scales, industrial process controls, bridge amplifiers, and medical instrumentation.
The document lists detailed electrical specifications, package options (SOIC and MSOP), absolute maximum ratings, typical performance curves, and an ordering guide for the AR, BR, and ARM grade parts.
| Gain range | 1 to 1000 |
|---|---|
| Power supply range | ±2.3 V to ±18 V |
| CMRR (G=1) | 80 dB minimum to 10 kHz |
| Input voltage noise (1 kHz) | 8 nV/√Hz |
| Small‑signal bandwidth (G=1) | 825 kHz |
The AD8221 gain can be set from 1 to 1000 using a single external resistor.
It operates from ±2.3 V up to ±18 V.
At a gain of 1, the device provides a minimum CMRR of 80 dB up to 10 kHz.