TMS320C6424: Recommended crystal oscillator frequency tolerance & stability for audio applications (PCM4)

Hello Haim, 

Thank you for the query.

The crystal requirements are captured in section 

6.6.1 Clock Input Option 1- Crystal

of 

https://www.ti.com/lit/ds/symlink/tms320c6424.pdf

The crystal selection is based on your specific system requirements. That is why the datasheet says, "The user should select crystals with low enough ppm to ensure good audio quality for the specific application."  The user in this case is the system designer.

Regards,

Sreenivasa