TMS320F28377D: Incorrect measured value on ADCINB0

Part Number:TMS320F28377D

Hi,

We are undergoing an issue on ADCINB0 pin of our TMS320F28377D.

The voltage value measured on the board is equal to 1.156V but the result of our acquisition outputs 1.204V (1644 ADC value).

In our design we are using an external reference voltage at 3V.

We have the following configuration:

• CPU frequency: 200MHz
• ADC Prescale: 0xF (Clock / 8.5)
• Resolution: 12 bits
• SOC: SW trigger / ADCINB0 / 200 as sampling windows

We monitored the acquired voltage value down to the via below the BGA so we are pretty sure of the voltage value.

Any idea ?

Clément