The AD623 is a low cost instrumentation amplifier from Analog Devices. It is easy to use and offers higher performance than discrete designs. It supports single/dual supply operation and has a rail-to-rail output swing. The input voltage range extends below ground by 150 mV (single supply). The device is low power, with a maximum supply current of 575 µA. Gain can be set with one external resistor, with a gain range of 1 (no resistor) to 1,000. The AD623 has high accuracy DC performance, with 0.1% gain accuracy (G = 1), 0.35% gain accuracy (G > 1), 25 ppm gain drift (G = 1), 200 µV maximum input offset voltage (AD623A), 2 µV/°C maximum input offset drift (AD623A), 100 µV maximum input offset voltage (AD623B), 1 µV/°C maximum input offset drift (AD623B) and 25 nA maximum input bias current.
The AD623 is a low‑cost, single‑supply instrumentation amplifier offering rail‑to‑rail output swing from +3 V to +12 V. It provides programmable gain from 1 to 1000 using a single external resistor and features low input offset voltage, low bias current, and high CMRR. Typical specifications include 800 kHz bandwidth at unity gain and 35 nV/√Hz noise.
Designed for medical instrumentation, sensor interfaces, thermocouple amplification, and industrial process control, the AD623 can operate from either single or dual supplies and includes built‑in protection features such as input clamping diodes and RF interference suppression.
| Gain Range | 1 to 1000 |
|---|---|
| Input Offset Voltage | 200 mV max (AD623A) |
| Supply Voltage Range | ±6 V (absolute max), +3 V to +12 V single‑supply |
| Bandwidth (G=1) | 800 kHz |
| Voltage Noise | 35 nV/√Hz at 1 kHz |
| CMRR | 90 dB min (G=10) |
The AD623 can be programmed for gains from 1 to 1000.
It operates from +3 V up to +12 V on a single supply.
The maximum input offset voltage is 200 mV for the AD623A version.
The AD623 provides an 800 kHz bandwidth when configured for a gain of 1.