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AM3354: ADC input

Part Number: AM3354

We have thermometers connected to AIN0 to AN2 as single-ended

The full scale range of the ADC is 0 to 1.8V.

It's 1.8V on both VDDA_ADC and VREFP while VREFN is connected to VSSA_ADC on the board. 

However it seems that ADC only gives us ~ 900mV full scale. 

Could it be ADC input setting was at differential? Any suggestions? Thank you.