Hi,
At first glance ...
Your Vref must be rock-stable ( Pic Decoupling ... What about ???) ... now result is +/- 1 digit ... = +/- 5 mv !!! ... a little HardWare scheme would be useful !!!
I'd recommend some external Vref ... if mV looked for !
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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