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LMK01010: Questions about Sync

Part Number: LMK01010
Other Parts Discussed in Thread: LMK01801, LMK01000

Tool/software:

I am planning to use differential input clock and differential output clock.
The clock of each output channel should have a delay control function for timing control.
The clock of the output channel does not have divide and only uses the delay function.
That is, the input clock and the output clock have the same frequency.
The material I found at TI is LMK01010.


1. Please recommend an IC among the clock buffers that can control the output channel delay.
2. If I use the delay function for the output channel without using sync and without divide in LMK01010, will the clocks of the output channels be synchronized to the input clock and output with a delay of the set delay value?
3. Even if the frequencies of the input clock and the output clock are the same, should I use the sync function when using the delay function for the output channel?

  • Hi, 

    See my feedback below, and let me know if you have any other questions. 

    1. I believe that LMK01000 would be our best option for a buffer with programmable delays for each output. LMK01801 could be an option as well but the delay is only programmable per bank, and not per individual output. 

    2. Yes, the input to output delay will be constant if divide and sync are not being used. Keep in mind that there is some fixed propagation delay even when the delay is bypassed. 

    3. You don't need to use the sync function if the divider is not being used. If a divider is being used, then you will need to sync to ensure phase determinism between the input and output. Sync will also cause outputs with different divider settings share an initial rising edge. 

    Regards, 

    Connor