Part Number: TMS320F28388D
Tool/software:
Hello Team,
We are currently working on testing the internal ADC of TMS320F28388D
During testing, We observed an issue related to ADC cross-talk when measuring multiple ADC channels simultaneously.
Observation:
Test Setup: ADCA2 and ADCA3 channels enabled for reading ADC raw value.
When I apply a voltage to A2, I notice an unintended voltage appearing on A3. For example, applying 3.3 V to A2 results in a variable voltage between ~0.6 V and 1.2 V on A3. The same occurs in reverse—applying voltage to A3 produces a reading on A2. This issue follows for all ADC bases (A,B,C,D)
Here are some observations of the ADC cross-talk issue:
1. In the screenshot below, we have given a voltage(ADC raw value 65535) to the ADCA1 channel, and we are getting an unnecessary ADC raw value on the ADCA2 and ADCA3 channels.
This cross-talk does not affect other ADC bases (B, C and D) and only affects ADC base A
2. Now we have given voltage to ADCB0 and we are getting unnecessary ADC raw value on ADCB2 and ADCB3.
This cross-talk does not affect other ADC bases (A, C and D) and only affects ADC base B
Please share your solution for this issue.
Thanks in advance.
Regards,
Praveen
