Termination of unused LVDS clock outputs

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    Question: What should be done with unused LVDS clock outputs?



    In general, it is best not to leave unused outputs unterminated, in order to reduce possible system noise. For an LVDS output pair, a 100 ohm load between the differential signals is the proper way to terminate the output. The driver, by specification, is current driven and this will create a known balanced state for the drivers. Leaving outputs unterminated may lead to increased noise or jitter on the used outputs.