SLAZ754B December 2023 – August 2025 MSPM0L1304-Q1 , MSPM0L1305-Q1 , MSPM0L1306-Q1
ADC Module
Functional
ADC SNR and DNL performance is worse when using VSSA for ADC ground reference.
When the ADC is using VSS as the ground reference, noise sources on the VSS ground will impact the ADC results, which results in worsened SNR and DNL performance.
Workaround 1: Use VREF+ and VREF- pins for the ADC reference. With the VREF- pin, the ADC will have its analog ground reference lessening the influence of external noise sources. Workaround 2: Reduce noise sources on VSS; common sources are CPU or Digital switching noise