Thank you do much. This is exactly what happens. In other words, connecting VDDA to VDD solves the problem.About connection between VREF and VDDA for having exact voltage for ADC refrence what should be done if there is ripple on VDD (except of LC/RC...
VREF-P is generated based on VCC and TL431 for producing accurate voltage because of ADC refrence. (for this reason I separate VDD from VDDA )Why should VREF-P be separated from VDDA?In datasheet these are connected to each other.I don't have any pro...