SNLS543 August 2018 DS90UH949A-Q1
This device provides separate power and ground pins for different portions of the circuit. This is done to isolate switching noise effects between different sections of the circuit. Separate planes on the PCB are typically not required. The Pin Functions table in the Pin Configuration and Functions section provides guidance on which circuit blocks are connected to which power pins. In some cases, an external filter many be used to provide clean power to sensitive circuits such as PLLs.