The LVDS serial output is rated for a 27Ω load. Can a different value be used?
Yes, you can use a different value. You should use whatever resistance matches the line that is being driven. The total RL we use is 27 Ω , this would be two 54 Ω resistors in parallel which represents a heavily loaded backplane. We have recommended 27 Ω because our AC characteristics slightly change with higher resistance. Specifically, rise and fall times could change. Also, keep in mind that with a higher value resistor you will have a higher Vod- differential swing.
