Desirable PPM for a wirelessUSB  LP system

Question: What is the desirable total PPm for a WirelessUSB LP based system?

 

Answer:

PPM is the abbreviation for ‘parts per million,’ a method of calculation used to specify the permissible frequency deviation of a crystal or oscillator. One PPM on a 12 MHz clock is 12 Hz and 10 PPM is 120 Hz.

Total PPM clock accuracy is the sum of base PPM, temperature PPM, aging PPM, and trim sensitivity PPM. Total PPM for a WirelessUSB LP system should be less than ±30 PPM.