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DS15EA101: Skew between parts

Kenji Ohno1
Genius 5095 points
Part Number: DS15EA101
Other Parts Discussed in Thread: DS25BR120

Hi Team,

My customer wants to know the skew between the parts of this device.

Please tell me the skew value.

Best Regards,

Kenji

  • 0
    TI__Guru* 91440 points

    Greetings Kanji,

    DS15EA101 is an adaptive equalizer. Adaptation time is typically 5mS. Worst case adaptation time has not been characterized. Therefor typically for any part within 5mS we would see output signal from the time signal is applied.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Genius 5095 points

    Hi,

    Sorry,late response.

    It was not the answer that my customers expected.

    For example, typ.45ps max.150ps.

    Is there no such rule for the adaptive equalizer?

    I would like to know what 5ms in the previous answer shows.

    Best Regards,

    Kenji

  • 0 in reply to Kenji Ohno1
    TI__Guru* 91440 points

    Greetings Kenji,

    5ms Shows the time from a signal applied to the DS15EA101 input to when we would expect valid output data.

    Please note data sheet specifies data transition time or rise/fall time on 100-ohm output in order of 220pS. 45ps or 145ps you have specified points to rise/fall time of the 100-ohm output.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Genius 5095 points

    Hi Nasser

    Thank you for answering my questions

    .Looking at the DS25BR120 datasheet, “Part to Part Skew” is explained as follows.

    ”Part to Part Skew, is defined as the difference between the minimum and maximum specified differential propagation delays.”

    Does DS15EA101 have specification?

    Best Regards,

    Kenji

  • 0 in reply to Kenji Ohno1
    TI__Guru* 91440 points

    Greetings Kenji,

    DS25BR120 part to part skew refers to skew within positive and negative output of the DS25BR120 device. This normally shows itself as DCD or Duty Cycle Distortion or jitter.

    On DS15EA101 this parameter is specified as total residual jitter. In data sheet, we have typical values for this parameter and you can add 30% to count for part to part variation, across temperature, and supply. However, this parameter has not been characterized over supply and temperature.

    Regards,,, Nasser