New Contributor
Regular ContributorHi,
I am Farabi who will support you on this request.
Max10 devices can't detect if the input clock is spread spectrum clock or not. It will detect the spread spectrum input clock as jittery clock input. I attached Max10 datasheet and at page 27, there is spec mention about acceptable input clock jitter. Typically, Max10 required a clean input clock with maximum peak-to-peak clock jitter of 200ps.
If you using 33khz spread spectrum input clock, I am afraid the jitter is too large and Max10 PLL can't detect the input clock signal you feed.
regards,
Farabi
New ContributorHello Farabi,
I understand your answer.
I've forget to precise that frequency deviation is about +-250ppm centered, and also frequency modulation about 33KHz.
In my point of vue, 33KHz is more a wander than a jitter, because of low speed of triangle modulation at 33Khz.
Am I wrong?
Did you experience some customer such a DSC63XXB with MAX10 family?
Thanks for your reply,
best regards,
Thierry
Regular ContributorHi Thierry,
Max10 link : https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/max-10/m10_datasheet.pdf
pls refer to page 27, fINclk input jitter must be below +/- 750ps.
DSC63xxB has 250ppm which converted to ps ~ around 20us = 20000ps.
hope this helps.
regards,
Farabi
Regular ContributorHi Thierry,
I am sorry, my calculation previously was wrong.
If 25MHz input clock with 250ppm jitter, that means is has around ~20ps jitter which meeting MAX10 input clock.
Meaning you can use DSC63xxB for input clock osc.
sorry for the confusion.
regards,
Farabi
