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Input Eye Requirement for LMH0344, LMH0302, and LMH0346

Other Parts Discussed in Thread: LMH0344, LMH0356, LMH0302, LMH0346

Dear Team,

Please share me the eye pattern requirement for below ICs.

1)LMH0344SQ/NOPB

2)LMH0302SQE/NOPB

3)LMH0346MH/NOPB

Also share me Ibis AMI model for above parts.also (.ami and .dll files)

Regards,

Prasanna G

  • Dear Team,

    Awaiting for the response.

    Regards,
    Prasanna G
  • Dear Team,

    Awaiting for the response, Reques you to upate us soon since the project is in critical stage.

    Regards,
    Prasanna G
  • Hi Prasanna,

    Our apologies for the delay in response. We were out on Thanksgiving vacation for most of last week and are getting caught up. We are working to respond to your request within the next day.

    Regards,

    Michael
  • Hi Prasanna,

    Can you elaborate more about what you mean by "eye pattern requirement?" I am assuming that the answers you are seeking are in the datasheet already under DC Electrical Characteristics and AC Electrical Characteristics as well as through SMPTE standards, since these devices are designed for SMPTE compaibility. Please let me know if I am misunderstanding your question.

    To determine whether these devices will work appropriately in your system, I suggest acquiring the appropriate EVM (SD3GDA) to evaluate the performance.

    I also checked our database of models. We only have IBIS models for the LMH0344 and LMH0302. For the LMH0346, please refer to the LMH0356.

    Thanks,

    Michael
  • Hello Michael,

    Actually i am required to know the below specifications for LMH0344,LMH0302 and LMH0346

    1)Input jitter tolerance is not specified for LMH0302 at 2.97Gbps, please provide the same.
    2)Input jitter tolerance for LMH0346 is >06UI,What does it mean ?
    3)Rise time and fall time requirement for LMH0344,LMH0302 and LMH0346.

    Regards,
    Prasanna G
  • Hi Prasanna,

    1. There is no input jitter tolerance requirement for the LMH0302, since it is a cable driver. Input jitter tolerance is a parameter applicable to reclockers, as this parameter determines the maximum amount of input jitter allowed before the reclocker is unable to retain lock. The parameter to pay attention to, instead, is the additive jitter parameter, which pertains to the amount of jitter that is typically added as a result of the signal passing through the cable driver.

    2.  According to SMPTE Standard RP184-1996, input jitter tolerance is defined as "peak-to-peak amplitude of sinusoidal jitter that, when applied to an equipment input, causes a specified degradation of error performance." Input jitter tolerance must be at least the requirement set by SMPTE standards.  I have posted the input jitter tolerance levels for multiple SMPTE data rates for convenience.

    The input jitter tolerance for the LMH0346 shows that the LMH0346 exceeds the SMPTE requirements and can therefore achieve and retain lock in the presence of at least the amount of jitter specified in the datasheet.

    3. From a SMPTE compatibility standpoint, rise and fall time requirements are only required for cable driver 75-ohm outputs.

    Therefore, only the LMH0302 is applicable for meeting a specific rise/fall time requirement defined by SMPTE. You can find the max rise/fall time in Table 6.6:

    The LMH0346 specifies both an input rise/fall time maximum in the datasheet, but this is not based on a SMPTE specification. Note that the LMH0344 output rise/fall time meets the LMH0346 input rise/fall time requirements.

    Lastly, it is assumed that the LMH0344 input is receiving an input signal from a driver device whose rise/fall times comply with SMPTE rise/fall time requirements.

    Thanks,

    Michael