AD629 Datasheet

• 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
• HIGH 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 drift
• EXCELLENT AC SPECIFICATIONS
  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

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.