AD629(High Common-Mode Voltage,Difference Amplifier)IntroductionThe 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 ±270V common- mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±500 V.The part 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 die and packaged form featuring 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.FeatureImproved replacement for: INA117P and INA117KU±270 V common-mode voltage rangeInput protection to – ±500 V common mode – ±500 V differential modeWide power supply range (±2.5 V to ±18 V)±10 V output swing on ±12 V supply1 mA maximum power supply currentHIGH ACCURACY DC PERFORMANCE – 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 driftEXCELLENT AC SPECIFICATIONS – 77 dB minimum CMRR @ 500 Hz (AD629A) – 86 dB minimum CMRR @ 500 Hz (AD629B) – 500 kHz bandwidthAppearance
