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LMK00308: Does LMK00308 accept sine-wave input?

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Replies: 6

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Part Number: LMK00308

Hi,

we need a clock buffer/mux which is able to multiplex two input and fan out 8 output . One of the input signals is LVDS(0-1000MHz), the other is analog sine-wave(0-100MHz). The output signal should be LVDS. LMK00308 looks nice, we want to know if it can support sine-wave input or is there any recommendation on how to make it work. Thanks!

Best,

HP

  • Yes, you can apply a sine-wave input through an AC coupling capacitor to the OSCin input pin (leave OSCout pin floating).

    Regards,

    Alan

  • In reply to Alan O:

    Thanks Alan for the confirmation.
    A follow up question: What is magnitude requirement for the sine-wave in order to interface OSCin? I only found the Fmax =250M but no info on magnitude.

    Best,
    HP
  • In reply to haopeng han:

    1 to 2 Vpp swing is the suggested range, and higher swing/slew rate is recommended for better performance.

    Regards,
    Alan

  • In reply to Alan O:

    Thanks Alan.

    In thread e2e.ti.com/.../697448 you suggested to connect the sine-wave to CLKin instead of OSCin. Which is better in terms of performance?
  • In reply to haopeng han:

    For a sine-wave with input, OSCin performs better than CLKin up to about 150 MHz In terms of additive phase noise/jitter. 

    If the single-ended input slew rate is faster than 2 V/ns, then CLKin will perform better than OSCin.

    Regards,
    Alan

  • In reply to Alan O:

    Thanks!

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