Application Note | August 21, 2014

Using Digital Potentiometers For Programmable Amplifier Gain

Source: Microchip Technology Inc.

Usually a sensor requires its output signal to be amplified before being converted to a digital representation. Many times an operational amplifier (op amp) is used to implement a signal gain circuit. The programmability of this type of circuit allows the following issues to be solved:

  • Optimization of the sensor output voltage range
  • Calibration of the amplifier circuit’s gain
  • Adapting gain to input signal variations
    • sensor characteristics change over temperature/voltage
    • multiple input sources into a single gain circuit
  • Field calibration updates
  • Increased reliability vs mechanical potentiometer
  • BOM consolidation – one op amp and one digital potentiometer supporting the various sensor options

For full access to this content, please Register or Sign In.

Access Content Using Digital Potentiometers For Programmable Amplifier Gain