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DS125BR401A: Does B channel has linear output drive

John Liu59
Intellectual 2735 points
Part Number: DS125BR401A

Dear all,

 In our datasheet, B channel has >10dB transmit DE, does the output of B channel has linear output drive just as A channel? Besides, for B channel, there is soft-limiting function, how to understand its function?

Thanks.

  • 0
    TI__Mastermind 29655 points

    Hi John,

    No, the B channel does not have the same advanced-linear driver that the A-channels have. When placing the DS125BR401A, the B-channel side should optimally be placed such that there is greater insertion loss at the B-channel input than at the A-channel input.

    The limiting functionality of the B-channel drivers can be considered as a means of quantizing the output. Thus, rather than a linear equalization, the DS125BR401A will make a decision to condition the output as a "1" or "0." Limiting is useful when link-training is NOT required, as this will affect subtleties in the signal transition edges (precursor and postcursor). For the DS125BR401A B-channel side, if your protocol requires link-training, it is recommended to MODE_B to Float.  For a visual example of the limiting vs. non-limiting/transparent function, please reference the graphic below:

    Thanks,

    Michael