This uC board is supposed to have two 12-bit DACs. But when I sweep from 0 to 4095, the DAC output stops increasing after around 4032 and settles to around 2.8V.
I power the board by its USB port.
What could be the reason for this?
I want to increase the resolution.
On page 433 it is mentioned: "An input reference pin, VREF+ (shared with ADC) is available for better resolution"
VDDA is an input which is an analog power supply. Absolute maximum ratings at page 203 of the datasheet:
Does that mean if I power this board via VDDA pin with 4V DC, I can power the VREF+ with 4V(to increase the resolution)?