SLAA635 September   2024 MSPM0G3507

 

  1.   1
  2. 1 Description
  3. 2 Required Peripherals
  4. 3 Compatible Devices
  5. 4 Design Notes
  6. 5 Design Steps
  7. 6 Device Configuration
  8. 7 Design Considerations
  9. 8 Reference
  10. 9 E2E
  11. 10Trademarks

4 Design Notes

The design of the two op amp instrumentation amplifier using the integrated amplifiers of the MSPM0 is not different from the design using discrete op amps. The Two op amp instrumentation amplifier circuit application note covers the design notes for this circuit. These are paraphrased in the following list for convenience:

  1. Rg sets the gain of the circuit.
  2. High-value resistors can degrade the phase margin of the circuit and introduce additional noise in the circuit.
  3. The ratio of R4 and R3 set the minimum gain when Rg is removed.
  4. Ratios of R2 / R1 and R4 / R3 must be matched to avoid degrading the DC CMRR of the instrumentation amplifier and to make sure the Vref gain is 1V/V.
  5. Linear operation is contingent upon the input common-mode and output swing ranges of the discrete op amps used. The linear output swing ranges are specific under the AOL test conditions in the device data sheet.