Good day,
I am using a CDCM61001 to generate the 200MHz clock on a board. The reference i am using is a ABM3B-25.000MHZ-10-1-U-T. Attached you will find a schematic of the clock generation section.
The output clock I am measuring appear to be less stable than I would expect by jumping in frequency by 130kHz and the first thing I am suspecting is my reference clock which is rated 10ppm. I do not fully understand how the shunt capacitance C1 should be calculated and I have been unsuccessful to find any practical documentation that explains this design choice. I am also not 100% sure if the XO I have chosen is acceptable.
Would it be possible to explain to me how to choose a suitable reference oscillator and shunt capacitor based on the requirements of the CDCM61001? Any other insight as to why my clock isn't as stable as expected would also be appreciated.
Thank you.
Regards,
Charl