AD8221 is a precision instrumentation amplifier with features such as wide power supply range, low noise, high accuracy, etc. It is suitable for applications such as weigh scales, industrial process controls, bridge amplifiers, precision data acquisition systems, medical instrumentation, etc.
The AD8221 precision instrumentation amplifier offers programmable gain from 1 to 1000 using a single external resistor. It provides industry‑leading common‑mode rejection (80 dB minimum to 10 kHz at G=1) and low input noise (8 nV/√Hz at 1 kHz), making it suitable for weigh scales, bridge amplifiers, and medical instrumentation.
The device operates from ±2.3 V to ±18 V supply, supports temperatures from –40 °C to +85 °C (specified performance) and up to +125 °C for operation, and is available in compact MSOP and SOIC packages. Detailed specifications, typical performance curves, and application circuits are provided throughout the document.
| Gain range | 1 to 1000 |
|---|---|
| CMRR (G=1) to 10 kHz | 80 dB min |
| Bandwidth (G=1) | 825 kHz –3 dB |
| Input voltage noise | 8 nV/√Hz @ 1 kHz |
| Supply voltage range | ±2.3 V to ±18 V |
| Operating temperature range (specified performance) | –40 °C to +85 °C |
The gain can be set from 1 to 1000 using a single external resistor.
It provides a minimum CMRR of 80 dB up to 10 kHz when the gain is set to 1.
The device operates from ±2.3 V to ±18 V.
The input voltage noise is 8 nV/√Hz at 1 kHz.