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