AD623 is a single supply, rail-to-rail, low cost instrumentation amplifier from AD with the features of easy to use, high performance, single/dual supply operation, rail-to-rail output swing, input voltage range extends to 150mV below ground (single supply), low power, 575µA maximum supply current, gain is set with one external resistor, gain range is from 1 (no resistor) to 1000
The AD623 is a low‑cost, single‑supply instrumentation amplifier that offers rail‑to‑rail output swing and a gain that can be set from 1 to 1 000 with a single external resistor. It operates from 2.5 V to 12 V (single supply) or ±2.5 V to ±6 V (dual supply) and consumes as little as 1.5 mW at 3 V.
Typical applications include thermocouple amplification, industrial process control, and low‑power data acquisition. The device provides high CMRR, low offset voltage, and low input bias current, making it suitable for precision measurement in battery‑powered systems.
| Gain range | 1 – 1000 |
|---|---|
| Input offset voltage (max) | 200 µV (AD623A) |
| Bandwidth (G = 1) | 800 kHz |
| Voltage noise (1 kHz, G=1) | 35 nV/√Hz |
The AD623 can be programmed for gains from 1 to 1 000.
The maximum input offset voltage is 200 µV for the AD623A version.