AD623 is a single supply, rail-to-rail, low cost instrumentation amplifier
The AD623 is an integrated instrumentation amplifier that operates from a single supply (3 V to 12 V) or dual supplies (±2.5 V to ±6 V). It offers rail‑to‑rail output swing, programmable gain using a single external resistor, and low‑power operation (≈1.5 mW at 3 V). Its high accuracy (0.1 % gain error at G=1) and low noise (35 nV/√Hz at 1 kHz) make it suitable for precision measurement applications.
Typical applications include thermocouple amplification, low‑power data acquisition, and industrial process control. The device is available in 8‑lead DIP, SOIC and uSOIC packages, and comes with ESD protection and detailed ordering options.
| Gain range | 1 to 1000 |
|---|---|
| Input offset voltage (typical) | 200 µV |
| Bandwidth (G=1) | 800 kHz |
| Voltage noise (1 kHz, G=1) | 35 nV/√Hz |
The AD623 gain can be set from 1 (no external resistor) up to 1000 using a single external resistor.