Source Impedance

The NI 656x LVDS data and event generation channels have a 100 Ω differential source impedance. For generation operations, terminate the transmission line with a 100 Ω parallel resistance.

Because the NI 656x interface cable (NI SHB12X-B12X) is a 100 Ω differential transmission line, when you use LVDS, you can build matched impedance systems with a 100 Ω differential termination as the load. LVDS specifications of the NI 656x are expected across 100 Ω source in parallel with 100 Ω destination termination (50 Ω DC load).