Hi Marco, The AVDD supply range specified in ADS8689 datasheet is 4.75V to 5.25V, a +5V power supply is recommended for AVDD, so you can use 3.3V for DVDD but you have to provide a +5V supply for AVDD. Also, the supplies should be decoupled with AGND/DGND with a proper capacitor on each supply pin. Please refer to the power supply recommendations and layout guidelines in the datasheet. Best regards Dale
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