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Original question:

TUSB9261: Oscillator recommendation

TUSB9261: Oscillator Jitter spec

Kurumi Hasegawa
Expert 7891 points
Part Number: TUSB9261

Hi team,

 

Related to the previous post, I’m still looking for oscillator that can meet the specs listed in section 6.8 of the TUSB9261 datasheet. But most of the oscillator’s datasheet does not state jitter parameter Tp-p. Would you please advice how to determine oscillator’s jitter? Is it possible to estimate from another parameter? How do we usually chose which oscillator to use?

 

Best regards,

Kurumi

  • 0
    TI__Mastermind 27925 points

    Hi Kurumi,

    The safest choice is usually the one that is present in one of our reference designs or EVMs.  Unfortunately, I don't see the crystal used in the TUSB9261DEMO EVM; however, you can still refer the TID-00882 reference design.

    Crystal: ECS-400-20-33-TR

    Regards,

    Nicholaus

  • 0 in reply to Nicholaus_Malone
    TI__Expert 7891 points

    Hi Nicholaus,

    ECS-400-20-33-TR is crystal, but we are looking for oscillator. I believe it is different type of component.

    How do we usually pick which oscillator to use, when there is jitter requirement? 

    Best regards,

    Kurumi

  • 0 in reply to Kurumi Hasegawa
    TI__Mastermind 27925 points

    Hi Kurumi,

    My mistake.  I don't believe we have tested an oscillator.  However, the oscillator spec list is in the datasheet.  If a TI oscillator is being used, then it would be best to ask about that oscillator to see if it meets the jitter specs listed in the TUSB9261 datasheet as they would have more expertise on the subject.  Otherwise, you'll need to ask the manufacturer of the oscillator.

    The total jitter spec int the total jitter should be less than 25 ps, the random jitter should be less than 0.8ps and the peak-to-peak jitter should be less than 50ps.

    Regards,

    Nicholaus