• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 338 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TLK1501: Transmitter output level (Vod(p) and Vod(d))

yoshiro kuno
Prodigy 10 points
Part Number: TLK1501

Thank you for your help

Please tell me about the output level specified on page 18 of the datasheet.

What settings are selected for Preemphasis VOD(p) and Deepasis VOD(d)?

I think that there are other TI buffers that select the level by setting the setting pin, but what is the specification of this IC?

Data Sheet :  TLK1501 0.6 TO 1.5GBPS TRANSCEIVER (Rev. F)

best regards

  • 0
    TI__Mastermind 19235 points

    Hi,

    You may refer to figure 12 for the voltage output parameter definitions. 

    For the default SerDes configuration the output values will be at around the typical (TYP) value. The user can tune the output by adjusting the RREF value. Refer to datasheet section "choosing RREF resistor values (page 21)" for details.

    Regards,

    Rodrigo Natal

  • 0 in reply to Rodrigo Natal
    Prodigy 10 points

    Hi,

    Thank you for your prompt reply. I'm sorry if this question is difficult to understand.
    I will ask you again.

    I think that pre-emphasis and deepasis are two methods of compensating characteristics on the transmission side according to the attenuation characteristics of the transmission line, but is this correct?
    If so, is there a way to select Vod(p) and Vod(d)?
    If the TLK1501 chooses depending on the situation, under what conditions will it choose between the two compensation methods?

    best regards,

    Yoshiro Kuno

  • 0 in reply to yoshiro kuno
    TI__Mastermind 19235 points

    Hi,

    I think that pre-emphasis and deepasis are two methods of compensating characteristics on the transmission side according to the attenuation characteristics of the transmission line, but is this correct? If so, is there a way to select Vod(p) and Vod(d)

    That is correct. De-emphasis and pre-emphasis allow the user to pre-distort the waveform in order to provide equalization. The level of VODP and VODD applies is determined by the value of RREF chosen. See datasheet snapshots below.

    Thanks,

    Rodrigo Natal

  • 0 in reply to Rodrigo Natal
    Prodigy 10 points

    Thank you for answering.

    Please let me check one more thing.

    For example, when outputting "1100" data from "DOUTTXP" and "DOUTTXN", is it possible to output only the Preemphasis VOD (or Deemphais VOD) waveform?
    Or does the TLK1501 decide whether to output the Vod(p) waveform or the Vod(d) waveform according to the bit pattern of the transmission data?

    When outputting the data of "1100", will it be the image of "Figure 12" in the data sheet?

    best regards,

    Yoshiro Kuno

  • 0 in reply to yoshiro kuno
    TI__Mastermind 19235 points

    The Pre-emphasis and De-emphasis applied to the signal combined provide complete post-cursor equalization. You need VODP and VODD to be incremented in tandem. By emphasizing the first bit in a given sequence you are effectively applying post cursor equalization. 

    Thanks,

    Rodrigo Natal