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How much Jitter can a Clock Cleaner Clean... ?

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Kentxu
Posted by
on Apr 13 2012 07:37 AM
Intellectual300 points

Hello,

I need to provide a low jitter <0.5ps rms clock for ADC conversion, and I have a "dirty" clock source with about 1ns jitter. Can this be cleaned, and which part would be recommended.

Thanks! Ken

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  • Fritz
    Posted by
    on Apr 13 2012 09:44 AM
    Expert4370 points

    Yes, for sure! You need a VCXO based jitter cleaner, such as:

    CDCM7005 (5 outputs, excellent power)

    CDCE72010 (10 outputs, EEPROM)

    LMK04800 family (dual loop architecture, allows you to buy a lower frequency VCXO if you need a particularly high ADC clock frequency)

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  • Kentxu
    Posted by
    on Apr 15 2012 07:08 AM
    Intellectual300 points

    Thanks for the info. These parts seem suitable, especially the LMK04800 with a xtal and varcap diode option to reduce cost.

    But I couldn't see any info on Jitter Tolerance. For example the Si53xx family shows a Jitter Tolerance of 5000/BW ns p-p, where BW = 120Hz, giving Jitter Tol = 42 ns p-p.

    Is the any info on the Jitter Tolerance for the Ti parts?

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