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Drive Strength of LMH1218 50-Ohm (100-Ohm Diff) output Driver

Other Parts Discussed in Thread: LMH1218, LMH0307

Hello, the LMH1218 is a very compelling product for which I was hoping to gain a little insight into the drive strength of the 100-Ohm Diff. outputs.  I understand the typical application for the 100-Ohm Diff outputs is to drive an optical module, SFP, or simple FR4 traces, all of which would not require much of a "cable driver" like output, and therefore might be very weak as compared to a typical Cable Driver output.  However, for my application, I would like to use these 100-Ohm Diff outputs for transmitting 3G/HD-SDI over several meters of UTP cabling, which does require a significantly stronger output driving stage (something equivalent to the LMH0307 for instance).

Thank you for your time and any insight you can offer on these specifications.

- Jay 

  • Hi Jay,

    LMH1218 OUT1 maximum differential swing is about 1V or 500mV single ended in to 50 ohm. So it means maximum we can source is about 10mA. Given the tolerance, +/- 10%, we will not be able to meet SMPTE required 800mV +/- 10% output swing.

    Regards,,nasser