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TMS320F28384S: ADC was affected by the value read in the previous SOC

Part Number: TMS320F28384S

Here is the questions from my customer. Please help on this.

When I checked the ADC of TMS320F28384, I found that it was greatly affected by the value read in the previous SOC.

Even if the hold time was increased, there was no change. And even if the Clock Prescaler of ADC was maximized, it was not solved. And then it was solved by putting GND (set to SOC).

Do you have experience to see or hear a similar phenomenon of this? Is there another solution to solve this issue? Are there any other settings that should be checked?