Tool/software: Code Composer Studio
I did what you suggested.
Instead of using ramps, I used DC inputs. For each channel, I collected the values from 9 conversions, considering a same DC input. I did that procedure for 3 different DC voltages (500mV, 1V and 1,5V), but, again, it seems that overtime the converted values are not varying.
The figure below are the data I collected.
It seems that with or without the input sinal, the output is always the same.
