This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMK04806: How to synchronize multiple LMK04806

Part Number: LMK04806

Tool/software:

Hi TIer

With the previous optimization, we changed the frequency of the phaser, which helped to increase the 64M clock alignment, but did not completely solve it.
1, When sync signal to the PLL, which clock be locked? For example, do we use a 0-delay single pll2 clock that is locked to the oscin pin?
2, if not the clock locked to the oscin pin (160M), is it locked to the Clock Distribution Path internal clock (see configuration should be 320M), This clock is internally larger than our oscin clock
What is the requirement for sync signals? For example, if Clock Distribution Path is 640M, then is my sync signal (given by fpga) to be locked to 640M

Thank you very much.

  • Hello,

    Using the SYNC input causes all active clock outputs to share a rising edge, as programmed by fixed digital delay. It does this by resetting the output dividers.  But yes, for single loop ZDM the output phase will be aligned with the input to OSCin.

    Let me know if this answers your question.

    Regards,

    Will