The AD629 is a high common-mode voltage, difference amplifier that can be used for high voltage current sensing, battery cell voltage monitoring, power supply current monitoring, motor controls, and isolation.
The AD629 is a unity‑gain differential‑to‑single‑ended amplifier designed for high common‑mode voltage applications. It offers a ±270 V common‑mode voltage range, input protection up to ±500 V, a wide power‑supply range (±2.5 V to ±18 V) and low offset, drift and gain error specifications.
Typical applications include high‑voltage current sensing, battery‑cell monitoring, power‑supply monitoring and motor‑control feedback. The device is available in 8‑lead PDIP and 8‑lead SOIC packages and is RoHS compliant.
| Common‑mode voltage range | ±270 V |
|---|---|
| Input protection | ±500 V common‑mode, ±500 V differential |
| Power‑supply range | ±2.5 V to ±18 V |
| Output swing | ±10 V on ±12 V supply |
| Gain error (typical) | 0.01 % |
| Gain nonlinearity (typical) | 4 ppm |
| CMRR (typical at 500 Hz) | 86 dB |
| Small‑signal -3 dB bandwidth | 500 kHz |
| Quiescent current (typical) | 0.9 mA |
The AD629 can operate with a common‑mode voltage range of ±270 V.
The device accepts supply voltages from ±2.5 V up to ±18 V.
The typical gain error is 0.01 %.
The small‑signal –3 dB bandwidth is 500 kHz.