Part Number: TMS320F280039C Other Parts Discussed in Thread: SYSCONFIG Tool/software: Hi Sir We encountered some problems when using the 280039 ADC module, described as follows The ADC samples the AC voltage and finds that the sampling results are distorted, as shown below Purple channel: ADC pin signal Dark blue Channel: ADC sampling result is used as DAC output signal: After amplification, it was found that there is a platform between 1.67V and 1.69V in the DAC signal, and the analog signal cannot be restored. Drawing the adc sampling results in CCS debug mode, we also found that there is a platform situation (the platform value is 2107 grid ADC). Also attached is the sysconfig settings, please help me clarify them. grateful (I have tried increasing the sampling time, but no improvement) 1. ADC linked to CPU timer, sampling frequency is 60kHz 2. The target sampling signal is 60Hz, and the sampling frequency is set to 60kHz. It should not be aliasing. 3. The third picture (CCS screen) is to manually adjust the DC source to simulate the sampling signal, which is very slow. Basically, you can see the same phenomenon by using a constant DC voltage. thanks.
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