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Clocking solution, 4 clocks

Jared Becker
Genius 11945 points

Other Parts Discussed in Thread: CDCE925, CDCE913, CDCM6208V1

Hi Team,

I have an application that requires four clock sources. I need two of the clocks at 25MHz, another clock at 120MHz, and the other one a 1MHz. If there is a solution with two dual outputs, that would be preferred for the layout.

I appreciate your support!

Jared

  • 0
    TI__Expert 5370 points
    Dear Jared,

    there are likely multiple solutions to this desired configuration. There is no mention on performance so I assume these are generic type clock.

    You could look at what VCO frequency is needed in a PLL to generate these frequencies by doing a calculation on least common multiplier (LCM). The answer in your case is 600 MHz.

    You can also go to ti.com at www.ti.com/.../clock-architect.html and input your requirement where the tools will give you a specified clock configuration based on your requirements.

    You may also be interested in the device CDCE925 with four output that will generate 25, 25,120 and 1 from a 25 MHz reference.

    I hope this helps.

    Regards
    Simon.
  • 0
    TI__Genius 16845 points

    Hi Jared,

    You could use CDCM6208V1 to generate all four of the clocks. You could also use CDCE913 if you need to generate single-ended clocks.

    These are just two of the solutions generated by Webench Clock Architect. You can use this tool to view some other possible solutions:

    Could you let me know your application requirements and I could try to find you the best solution?

    • What is the input frequency and clock format (XTAL, LVCMOS, LVPECL, etc.)?
    • What are the output clock formats?
    • Are there any other requirements?

    Kind regards,
    Lane