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SN65LVDS31-EP: Source Impedance Matching

Michael Spalluzzi
Prodigy 20 points
Part Number: SN65LVDS31-EP


Is it necessary to have an output series resistor on the LVDS outputs when driving a 100ohm differential load?

Output load is shown to be 5 ohms so a 45-ohm series resistor should help with reflections?

- Michael

  • +1
    TI__Mastermind 25600 points

    Hello Michael,

    It's not necessary to add series resistors on the output of the LVDS driver. The output characteristic impedance should match the differential load. In other words, if using a 100 Ω load, then each output trace should be 50 Ω. See image below.

    Regards,

    Josh