PLUGIN catalogue 2018

ERVAC SpaceWire - Technical data 39 Feedthrough quali cation This technical note is a validation of PLUG-IN feedthrough reference 0614-01, 0614-02, 0614-03 regarding electrical signal transmission dedicated to SpaceWire links. Time Domain transmission measurements test procedure. For speed data rate range from 50 to 3200 Mb/s, we can use the ParBERT81250 generator. If we need to generate signal over 3200 Mb/s we can use the N4903A (from 620 Mb/s to 12500 Mb/s) in this case, as the maximum SpaceWire speed is set to 400Mb/s we can use ParBERT81250. Signal analyser CSA8000B is used to build a Eye Pattern and to measure several parameters like: - Qfactor, Eye Height, Eye Width, RMS Jitter and Peak to Peak Jitter. The signal is generated from 2 Ports (DATA+ & DATA-) to inject the signal in di erential directly in the cable through the test jig without any balun. The PRBS binary sequence of the signal is set to 231-1 and the di erencial peak-to-peak voltage is set to 0.5Vpp. (+250mv to -250mv swing) The minimum guaranteed output level of an LVDS transmitter is ±250 mV. The required LVDS receiver input is ±100 mV. The overall eye pattern from the LVDS transmitter to the LVDS receiver shall be comprised within the mask de ned in gure 5.2b when the transmitter mask is conforming to gure 5.2a. Eye pattern shall be frozen after 1000 acquisitions and the following parameters will be measured on it : Mask go/no go test