What is PVDD and AVDD?
The first thing you should do when trying to figure this out is to find and thoroughly read the datasheet. You will find the answer on page 2: 



PVDD (Power Vdd) is the pin that the current to drive the speakers comes from (a relatively high current). VDD/AVDD is analog Vdd which is the lower current that is used to power the rest of the chip. They are kept separate so they can be bypassed separately to keep PVDD from affecting AVDD.