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LMH0307 Single-Ended Inputs

Tim Lipsky
Prodigy 220 points
Other Parts Discussed in Thread: LMH0307, LMH0340

The data sheet for the LMH0307 talks about being able to accept single ended input but only shows how to accept differential input.

What is the proper termination for single-ended input to the LMH0307?   The driver is LMH0340.

Thanks,

Tim

  • 0
    TI__Guru* 93670 points

    Hi Tim,

    LMH0340 has integrated 75 Ohm cable driver. Also, LMH0307 has dual 75 ohm cable driver. So i thought perhaps LMH0340 could meet your need so you may not need LMH0307. Please note if you are not using DVB/ASI, you can use both positive and negative side of the LMH0340 since SMPTE is not polarity sensitive(other than DVB/ASI).

    I suppose there is a reason you must use both LMH0340 and LMH0307, in this case you can use LMH0340 as a 50 ohm driver(i.e replace 75 Ohm pullup with 50 Ohm) and then AC couple to the input of the LMH0307 with 100 Ohm R on the input. The output swing of the LMH0340 would be less(~600mV) but this should be good enough for the LMH0307. 

    Regards,,nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 220 points

    Hi Nasser,


    Thanks, that answers it.


    Tim