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TMS320F28235-Q1: ADC internal reference

Part Number: TMS320F28235-Q1
Other Parts Discussed in Thread: REF3030


Customer faced one issue during F28235 power on: after power on, in the first 3 minutes, all of the channels' value are 1.25 times larger. 3 minutes later, the issue left. Converter values are all right.

For example, the input voltage is 1V, the adc result should be 1365. But it is 1706 in the first 3 minutes. After that, it comes back to 1365. All of the channels have the issue.

After F28235 power on, the system works well, as we can get every data from CAN port. 

It's not possible to reproduce.

What could be the issue?

What's ADC internal reference, is it like TI part Ref3030, or others?

Br, Jordan