VDDANA should be connected to a well regulated supply. It is recommended to bypass this supply with a 0.1uF capacitor as close as possible to the bump and a 10uF capacitor to GND_ANA. How you want to generate that supply depends on you and you can use a LDO or a buck converter of a PMIC e.g. MAX20303. You can use a stable voltage reference too (MAX6070) as long as it is capable to provide the required current.