SLAAE93 February   2023 MSPM0G1105 , MSPM0G1106 , MSPM0G1107 , MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G3105 , MSPM0G3106 , MSPM0G3107 , MSPM0G3505 , MSPM0G3506 , MSPM0G3507 , MSPM0L1105 , MSPM0L1106 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346

 

  1.   Trademarks
  2. 1MSPM0 Family Overview
  3. 2MSPM0 Main Analog Features
    1. 2.1 Best-in-Class 12-Bit ADC Integrated
    2. 2.2 Dual Mode Comparator With Reference DAC
    3. 2.3 Buffered 12-Bit 1-Msps DAC
    4. 2.4 Zero-Drift and Zero-Crossover Chopper OPA
  4. 3Easily and Flexibly Create the System With MSPM0 Analog Peripherals
    1. 3.1 ADC Sample and Conversion
    2. 3.2 Differential and Cascade OPA Configurations
    3. 3.3 Window Comparator Mode
    4. 3.4 Internal Connections Between Different Analog Peripherals
  5. 4Analog Comparison With STM32
  6. 5References

3.2 Differential and Cascade OPA Configurations

Some MSPM0G and MSPM0L devices support two OPAs. If two OPAs are available on the device, they can be used as a differential amplifier or as cascaded mode.

#FIG_UM1_HLP_VVB shows an example of how to form a differential amplifier with two OPAs in an MSPM0 device.

Figure 3-2 MSPM0 OPAs as a Differential Ampler

This circuit either adds or subtracts the voltages based on the resistors R1 and R2. The voltage difference can be calculated by the equation in the diagram, and the OPA output can also be measured by MSPM0 on board ADC or as an input to the comparator.

If the gain of one OPA is not enough, to obtain additional gain, the two OPAs can be configured as cascaded mode. #FIG_XFV_PLP_VVB shows a diagram of a cascaded amplifier. The total gain is based on the configurations of the resistors R1, R2, R3, and R4.

Figure 3-3 MSPM0 OPAs in Cascade Mode