Catalog
High Common-Mode Voltage, Difference Amplifier
Key Features
• Improved replacement for: INA117P and INA117KU
• ±270 V common-mode voltage range
• Input 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 current
• HIGH ACCURACY DC PERFORMANCE3 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
• EXCELLENT AC SPECIFICATIONS77 dB minimum CMRR @ 500 Hz (AD629A)86 dB minimum CMRR @ 500 Hz (AD629B)500 kHz bandwidth
Description
AI
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.ApplicationsHigh voltage current sensingBattery cell voltage monitorsPower supply current monitorsMotor controlsIsolation
