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LMH0387 Extended 3G reach mode mechanism

Toshi
Expert 1780 points
I’d like to know the mechanism of the Extended 3G reach mode. Does it control a eq. gain ? Also does it must turn off when the device receive , SD, HD and short cable 3G ? My customer has to use the mode because of poor 3G performance(worst case is 30m) in their system. So they want to know the mechanism in detail.
  • 0
    TI__Guru* 93570 points
    Hi Kobayashi-San,

    The extended reach mode allows for additional cable reach at 2.97 Gbps at the expense of slightly higher output jitter. The extended 3G reach mode provides 15m of additional Belden 1694A cable reach, with an increase of output jitter at this longer cable length of 0.05 to 0.1 UI.
    The extended 3G reach mode is accessible via bit 2 of SPI register 00h. Given the extra jitter, please let me know if this is what the customer needs to do.

    Regards,,nasser
  • 0 in reply to Nasser Mohammadi
    Expert 1780 points

    Nasser-san,

    Thank you very much for your answer.

    Well, I'd like to knwo the following point;

    - When the device receive SD, HD rate signal, Is it need to turn off the Extended 3G reach mode ?

     ( Cable reach point of view.)

  • 0 in reply to Toshi
    TI__Guru* 93570 points
    Kobayashi-San,

    Internal to the part, there are two signal paths: One for HD and 3G and another for SD. So for SD we need to turn off the extended reach mode.

    Regards,,nasser