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LMH0340 to DS30EA101

fearghal rudden
Intellectual 480 points
Other Parts Discussed in Thread: LMH0340, DS30EA101, LMH0394, LMH0384

Hi,

We have recently prototyped a design incorporating the LMH0340 serializer. The SDI output is designed as follows and connects to a 75 ohm coaxial output jack: 

I want to pass the output of this circuit over coaxial cable to another PCB (approx 10cm cable length). I'll be using the same 75 ohm coaxial jack to receive the signal but I want to convert the SDI signal received to a differential signal (LVDS).

Can you tell me if the DS30EA101 adaptive equalizer IC is the correct component to incorporate onto my second PCB to accomplish this task or what complications could occur if I just try to use a Balun?

Thank you,

Best Regards,

Fearghal

  • 0
    TI__Expert 4400 points

    The DS30EA101 adaptive cable equalizer will work well for this application.  Other adaptive cable equalizers you could use instead of the DS30EA101 are the LMH0384 or LMH0394.  Any of these ICs will solve this issue: They will receive the 75Ω single-ended SDI signal and provide a 100Ω LVDS output signal.

    If you use a balun for this, you would need to convert the 75Ω signal to 50Ω, and then use a pulse splitter to split this signal into two 50Ω outputs.  You may not get the signal levels you want after this, and the baluns may not support the bandwidth you need.

    I think the cleanest solution is to use one of these equalizer ICs (DS30EA101, LMH0384, or LMH0394) because they will do the 75Ω single-ended to 100Ω differential conversion, support SDI signals, and provide LVDS compatible outputs.

    Gary Melchior