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LMH0397: EQ/Cable

hiram zou
Prodigy 30 points
Part Number: LMH0397
Other Parts Discussed in Thread: LMH1297EVM

Tool/software:

Dears

LMH0397 datasheet shows when it work as a receiver at EQ mode, cable length can reach 200m at 2.97Gbps (with Belden1694A cabel)

Refer Belden1694A datasheet，the cabel attenuation at 1.5GHz is 7.8dB/100ft (25.7dB/100m)

Q1:

Can we evaluate the LMH0397 EQ mode could work at maxium 51.4dB cable attenuation condition ?

In our project ,want to use a 20m RG179 cabel (total attenuation is 21dB) .Is it available ？

Q2:

If SDI_Out is enabled, use second 75Ω driver as loop-through output in EQ mode, how much affect on cable reach length ? 

Thanks

Hiram

  • 0
    TI__Mastermind 30690 points

    Hi Hiram,

    hiram zou said:
    Can we evaluate the LMH0397 EQ mode could work at maxium 51.4dB cable attenuation condition ?

    Yes with Belden1694 we have validated the EQ is enough to compensate 200m (51.4dB). If your cable is 21dB LMH0397 should work.

    hiram zou said:
    If SDI_Out is enabled, use second 75Ω driver as loop-through output in EQ mode, how much affect on cable reach length ? 

    I do not see test data on this, so I recommend using the EVM or IBIS model to validate. Similar to this E2E, the LMH1297EVM (or IBIS Model) can be used to show performance on LMH0397 up to 3Gbps.

    Best,

    Shane