Forum Discussion

THAUS1's avatar
THAUS1
Icon for New Contributor rankNew Contributor
4 years ago

MAX10 PLL with spread spectrum input

Hello, I plan to use MAX10 FPGA PLLs, with Microchip a 25MHz DSC63xxB mems oscillator with spread spectrum feature. I would like to know is MAX10 PLLs are able to lock on spreadspectrum modulation...
THAUS1's avatar
THAUS1
Icon for New Contributor rankNew Contributor
4 years ago

Hello 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

  • Farabi's avatar
    Farabi
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    Hi 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