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CDCE62002: Is the jitter cleaner function works automatic?

Hung Ching Hsu
Expert 3086 points
Part Number: CDCE62002
Other Parts Discussed in Thread: CDCM6208, LMK05318, LMK04832

Hi Team

My customer asked if the jitter cleaner function works automatic in CDCE62002?

For example, the ouput of U0P/U0N and U1P/U1N will automatically be jitter-cleaned clock ? 

Or it can be controlled by ON/OFF function?

Second, is there any material shows how good the jitter cleaner works?

For example, the output jitter will be within ?% or a number.

Best Regards,

  • 0
    TI__Mastermind 18070 points

    Hi,

    The jitter cleaner functionality is achieved by reducing the PLL loop bandwidth, so that the output phase noise is equivalently replaced by the VCO phase noise after the bandwidth.

    Therefore, you'll need to adjust the loop components in order to narrow down loop bandwidth.

    You can use the GUI software to design its loop filter.

    For more clock background, please watch our clock training videos on TI precision lab.

    Regards,
    Hao

  • 0 in reply to Hao Z
    TI__Expert 3086 points

    Hi Hao 

    As you mentioned as below, my customer is asking that do you have any material shows VCO phase noise characteristic of CDCE62002? 

    "The jitter cleaner functionality is achieved by reducing the PLL loop bandwidth, so that the output phase noise is equivalently replaced by the VCO phase noise after the bandwidth."

  • 0 in reply to Hao Z
    TI__Expert 3086 points

    Hi Hao 

    Sorry to push you like this, but do you have any material shows VCO phase noise characteristic of CDCE62002?

    I think it would help push the customer to decide to use the device.

  • 0 in reply to Hung Ching Hsu
    TI__Mastermind 18070 points

    Hi Hung Ching,

    Sorry for the delay, I was out of office. This is what's found in the datasheet - 6ps typical RMS jitter.

    I could not find a VCO phase noise plot. If the performance is not good enough, please consider the dual loop jitter cleaners such as LMK04832, or the newer device LMK05318. CDCM6208 also has slightly better performance than CDCE62002 The jitter cleaner portfolio is here: https://www.ti.com/clocks-timing/jitter-cleaners-synchronizers/products.html

    Regards,
    Hao