• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 32 subscribers
  • Views 729 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS15EA101 - Input Interfacing

Hiroshi Katsunaga
Mastermind 6480 points
Other Parts Discussed in Thread: DS15EA101

Hello,

My customer has a question about DS15EA101.

My understanding is as follows.

  • The input signal amplitude must be 800mVppd +/- 10% (VID=400mV  +/- 10%) because its automatic equalization circuitry is dependant on the signal amplitude.
  • The optimal amplitude is VID=400mV.
  • Any deviation from the optimal amplitude in either direction will cause the equalizer filter to assert either excessive or insufficient amount of gain as illastrated in SNLA112E Figure 2.

[Q]

For example, Does VID=400mV +/- 10% mean the part which I showed as follows in datasheet Figure 15?

Best Regards,

Hiroshi Katsuanga

  • 0
    TI__Mastermind 29655 points
    Hi Katsunaga-san,

    As clarification, the optimal VID amplitude you are referring to should apply to the launch amplitude from the Tx, as opposed to the amplitude measured at the input pins of the DS15EA101. With that having been said, it is still a fair assumption for your question to assume that the outermost lines of the waveforms is an amplitude of 400 mV (800 mVp-p). Due to frequency-dependent attenuation, increasingly high frequency data will begin to close the eye as the interconnect media increases. However, the low frequency content in the data stream will remain relatively un-attenuated, and therefore you can expect the measurement you have highlighted in blue to be approximately 400 mV (800 mVp-p).

    Thanks,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Mastermind 6480 points
    Hi Michael-san,

    Thank you for your fast response.

    I understood your all comments.

    Thank you for your cooperation.

    Best Regards,
    Hiroshi Katsunaga