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What signal splitter terminations

Other Parts Discussed in Thread: CDCLVD2102, CDCLVC1102

Hello, I am planning to add a second port to an existing drive of a TFT display panel. To drive two twin displays I plan a signal splitter circuit described by the attached schematic.

My question is, do I use 100-ohm terminations at the LVDS inputs (the clock rates are 33.3MHz or less)? The part is CDCLVD2102.

For the LVCMOS 1:2 buffer outputs I plan to use 5-ohm series terminations, the part is CDCLVC1102. Is there anything else I forgot?

 Regards, Jim Gabel

LVDS splitter.pdf

Schematic

  • Hi James,

    Assuming that the LVDS inputs are DC coupled, 100 ohm diff. is the recommended termination. As this is a video port (DF13A connector), it is recommended to AC couple near the connector with 0.1 uF coupling caps. Also, it's recommend to place the 0.1 uF decoupling caps on Vcc near the device pins if possible.

    Rs is recommended to be 10 ohm to minimize reflections, assuming Z0 of 50 ohm on the transmission line on the CDCLVC1102.

    Gabe

  • Hello Gabe, Thank you for your good advice! Regards, Jim Gabel