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DS25BR101: transmission distance information of ds25br101

Chen Pan
Prodigy 70 points
Part Number: DS25BR101

I didn't find out the transmission distance  information of ds25br101in the datasheet. Can  you e help it?Thank you

  • 0
    TI__Guru* 93290 points

    Greetings Pan,

    1). For DS25BR101 evaluation, different test channels were used(please note Test Channel Loss Characteristics table). Using these test channels, DS25BR101 parametric table(AC Electrical Characteristics table on page 5 of the data sheet) indicates jitter at different media length. Please compare your media versus test channels A through F. Then you can refer to the AC Electrical Characteristic table to figure out the expected jitter and if this meets your FPGA or ASIC requirements.

    2). Alternatively, you can also use Figure 11 - Input voltage versus residual jitter. Knowing the transmit level and insertion loss of your media, you can refer to this table and figure out the expected jitter. Then again check with your ASIC or FPGA receiver requirements.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    TI__Prodigy 70 points

    Thank you for your reply! There are two more questions ,could you please help to answer ?


    1. According to your reply,  consider the transmission distance of ds25br101through two main parameters: jitter (page 5) and test channel loss characteristic (page 11)?
    2. For ds25br101, when used as pre-emphasis and equalization (FIG. 16), the transmission distance is twice the length of test channel. When used as equalization (Figure 17), the transmission distance is  the length of the test channel, right?
    But in both situation, the test channel loss characteristics are the same conform to the table on page 11?

  • 0 in reply to Chen Pan
    TI__Guru* 93290 points

    Greetings,

    1). Your understanding is correct.

    2). Please note jitter performance result in AC Electrical Characteristic table on pages 5 and 6. This table specifies output jitter based on different media board used on input AND OR output.

    Regards,, Nasser