2.1 Configuring the Operational Amplifiers

The OPAMP settings must be configured before the amplifier is enabled. Following is a brief description of significant bit fields and groups in the Operational Amplifier Control registers:

  • Select the positive input in OPAMPCTRLx.MUXPOS.
  • Select the negative input in OPAMPCTRLx.MUXNEG.
  • Select RES1EN if resistor ladder is used.
  • Select the input for the resistor ladder in OPAMPCTRLx.RES1MUX.
  • Select the potentiometer selection of the resistor ladder in OPAMPCTRLx.POTMUX.
  • Select the VCC input for the resistor ladder in OPAMPCTRLx.RES2VCC.
  • Connect the operational amplifier output to the resistor ladder using OPAMPCTRLx.RES2OUT.
  • Select the trade-off between speed and energy consumption in OPAMPCTRLx.BIAS.