We are looking for a bit more info on the RC that should be placed between AVcc
and DVcc when using a single supply. Which direction should the RC flow?
I believe that a small value resistor e.g 10 Ohms should be sufficient to
separate the digital noise on the digital supply from the analog supply pins.
The system's analogue supply should be connected directly to the AVDD and the
resistor to DVDD should be tapped off at a point which minimises the path
shared by AVDD and DVDD supplies.