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DS32EL0124: Datasheet Clarification

Amanda Ross95
Intellectual 2740 points
Part Number: DS32EL0124

Hello There

I would like to clarify some information from the datasheet if possible.

The way we read the “CML Input Timing Specification” for the “Serial Input Jitter Tolerance” parameter for a 3.125Gbps data rate is:

  • The low frequency jitter (f<10KHz) is 70 UI.  In other words, it is very tolerant of low frequency jitter.  My customer says they've seen several UI before, but never 70 and want to verify that it is correct. Seeing as there is no errata or revision succeeding this stating otherwise, I assume it is. Just covering all my bases.

  • The high frequency jitter (f>1MHz) is 0.3 UI or at 3.125Gbps which is (1/3.125Gbps)*(2)*0.3 = 192pSec (factor of 2 is conversion of bps to hertz). Correct?
  • What is the jitter specification between 10KHz and 1MHz.

 

I appreciate any feedback you can offer on this subject.

-Amanda

  • 0
    TI__Intellectual 2915 points
    Hi Amanda,

    I confirmed the datasheet with another application engineer. The 70 UI is the correct number in the datasheet. It’s very tolerate for very low frequency jitter because the jitter is way below the PLL bandwidth

    There is no need to convert to hz in the jitter calculation. The jitter = (1/3.125Gbps)*0.3 = 96ps

    There is no jitter specification between 10Khz to 1Mhz.

    Regards,
    Dennis