SSDA010 August   2025 MSPM0G3507

 

  1.   1
  2. 1Description
  3. 2Required Peripherals
  4. 3Design Steps
  5. 4Design Considerations
  6. 5Software Flow Chart
  7. 6Device Configuration
  8. 7Application Code
    1. 7.1 Application Code – Cascaded Signal Computation
  9. 8Results
  10. 9Additional Resources
  11.   Trademarks

1 Description

This subsystem uses two cascaded op amps with DAC-controlled biasing to remove DC drift and prevent output saturation. A feedback loop centers the signal in real time, preserving dynamic range, and enabling UART transmission.

MSPM0G3507 1 Real-Time Correction of DC Drift Figure 1-1 1 Real-Time Correction of DC Drift

The subsystem consists of a cascaded two-stage op-amp architecture implemented using the MSPM0's internal OPAs, ADCs, and DACs. The first stage (OPA0) amplifies the input signal with a programmable gain (Gain 1) and applies a DC offset through DAC8_0 to maintain the signal is centered around the ADC midpoint. The second stage (OPA1), also with programmable gain (Gain 2), provides further amplification while the output is monitored and dynamically corrected using DAC8_1 to avoid saturation. Both stages are actively controlled in real-time through ADC feedback and digital compensation logic to maintain good dynamic range for signal acquisition.

MSPM0G3507 High Gain Self-Compensating ADC Architecture Figure 1-2 High Gain Self-Compensating ADC Architecture