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DS125BR800A: Use DS125BR800A as redriver / signal conditioner

Chenglin WU
Prodigy 205 points
Part Number: DS125BR800A
Other Parts Discussed in Thread: DS64BR111, DS80PCI800

Hi Team

We are currently looking uni-directional re-driver with EQ function , and wondering if out driver is CML, but protocol unknown. (Not PCIe or SATA/SAS)

Can we use DS125BR800A as redriver / signal conditioner ?

If yes, what extra setting should we configure through register?

If not, is there any redriver with EQ option suitable for 4.5Gbps ~ 5.4Gbps CML link?

Regards,

Chenglin WU

  • 0
    TI__Guru* 93670 points

    Hi Chenglin,

    It seems your data rate is limited to 5.4Gbps. Given this, perhaps DS64BR111 maybe a better option. This device provide more gain at the nyquist frequency of the data rate that you are interested in.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 205 points

    Hi Nasser,

    Thanks for the information.

    You are correct, the characteristic of DS64BR111 seems better, however, we got 24 uni-direction lanes that required to enhance the signal integrity.

    To use DS64BR111, we can't control them by just one SMBus, also the output swing is limited to 700mV if using only pin setting.

    That's the major reason we want to choose DS125BR800A, but wondering are the characteristic of DS64BR111 per channel the same with DS125BR800A except support frequency?

    Regards,

    Chenglin WU

  • 0 in reply to Chenglin WU
    TI__Guru* 93670 points

    Hi Chenglin,

    I now understand your application. Given you need 24 uni-direction, we need to use a part with as many lanes as possible therefor DS125BR800A could be a better option. Another idea is to consider DS80PCI800 part as well(with RX Detect forced to 50-ohm). These two devices are designed to achieve maximum gain at higher frequency. They may meet your requirements. Suggestion is to use IBIS-AMI model of these devices and simulate using your media s-parameter to make sure these would meet your media insertion loss requirement. You can also note data sheet EQ level versus gain as well.

    Regards,, Nasser