ADF7030-1 designs: TCXO vs. XTAL

Hi Community,

In ADF7030-1 data sheet,

EV-ADF70301-868BZ uses TCXO,

EV-ADF70301-915AZ uses XTAL,

and others also have different type of 26 MHz part.

Please advise which type should be chosen in which condition.

Please also advise more documentations regarding this issue.

regards,

ping