ADI AD629ARZ

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 ±270V. 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 ±500V. 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 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

• Improved replacement for: INA117P and INA117KU
• ±270 V common- mode voltage range
• Input protection to +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)
• 20μV / °C maximum offset drift (AD629A)
• 10μV / °C maximum offset drift (AD629B)
• 10ppm / °C maximum gain drift
• 77 dB minimum CMRR @500 Hz (AD629A)
• 86 dB minimum CMRR @500 Hz (AD629B)
• 500 kHz bandwidth

• High voltage current sensing
• Battery cell voltage monitors
• Power supply current monitors
• Motor controls
• Isolation