Hi Joseph, I have finally tried tu use a voltage reference Vrefp at 1.65V with all INxN at 1.65V as well and effectively I get the full digital range for 16bit from 0x8000 to 0x7FFF for an input analog range of 0V to 3.3V. It is recommended a minimum voltage reference of 2V but it seems to work well at 1.65V as well. Many thanks again for your help, Jorge.
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