Analog Devices Inc. AD8479 Precision Difference Amplifier

Analog Devices Inc. AD8479 Precision Difference Amplifier is a difference amplifier with a very high input common-mode voltage range. The AD8479 is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±600V. The AD8479 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±600V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±600V. The AD8479 has low offset voltage, low offset voltage drift, low gain drift, low common-mode rejection drift, and excellent common-mode rejection ratio (CMRR) over a wide frequency range.


  • ±600V common-mode voltage range
  • Rail-to-rail output
  • Fixed gain of 1
  • Wide power supply range of ±2.5V to ±18V
  • 550μA typical power supply current
  • 90dB minimum CMRR
  • Excellent AC specifications
  • 130kHz bandwidth
  • High accuracy dc performance
  • 5ppm maximum gain nonlinearity
  • 10μV/°C maximum offset voltage drift
  • 5ppm/°C maximum gain drift


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

Additional Resources

Adjusting the Gain of a Fixed-Gain Difference Amplifier

Is it possible to increase the gain of a fixed-gain difference amplifier? Yes! Read this article to find out how.

Learn More

Functional Block Diagram

Block Diagram - Analog Devices Inc. AD8479 Precision Difference Amplifier
Published: 2014-07-11 | Updated: 2022-06-16