高共模电压，差分放大器 High Common-Mode Voltage, Difference Amplifier
Product Details
The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V.
The AD629 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±270 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±500 V.
The AD629 has low offset, low offset drift, low gain error drift, low common-mode rejection drift, and excellent CMRR over a wide frequency range.
The AD629 is available in low cost, 8-lead PDIP and 8-lead SOIC packages. For all packages including die and grades, performance is guaranteed over the industrial temperature range of −40°C to +85°C.
**Applications**
### Features and Benefits
±500 V common mode
±500 V differential mode
Wide power supply range ±2.5 V to ±18 V
±10 V output swing on ±12 V supply
1 mA maximum power supply current
3 ppm maximum gain nonlinearity AD629B
20 μV/°C maximum offset drift AD629A
10 μV/°C maximum offset drift AD629B
10 ppm/°C maximum gain drift
77 dB minimum CMRR @ 500 Hz AD629A
86 dB minimum CMRR @ 500 Hz AD629B
500 kHz bandwidth