Resolved! ADC Sampling of Voltages > 2.8V effects VDD
Using STM32L431RCT6 (VDDA and VREF+ bondet together). VDDA/VREF is 3.0V and VDD is 1.8V. If i'm sampling voltages larger then 2.8V that effects VDD (Jumping from 1.8V to approx. 2.06V for approx. 400ms). Any Idea's what i'm doing wrong?