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Selecting the Right ESD Diode Slide 13

For DisplayPort interfaces, the signaling scheme is similar to the other high speed signaling where differential signaling is used. Each of the four differential pairs are separated by a ground pin. The high speed lanes can transmit and receive up to 5 Gbps whereas the communication channel labeled as “Config” and “AUX” channels are relatively lower speed. Because of hot-plugging requirements, the cable can be disconnected while any of the application ports are still running. External ESD protection to handle these potential ESD and cable surge events are necessary to protect the IC. DisplayPort uses transition minimized differential signaling (TMDS) which is similar to low-voltage differential signaling (LVDS) in that it uses differential signaling to reduce electromagnetic interference (EMI) which allows faster signal transfers with increased accuracy. TMDS uses a twisted pair for noise reduction instead of coaxial cabling. Like LVDS, the data is transmitted serially over the data link. When transmitting video data, three TMDS twisted pairs, corresponding to a different RGB component, are used to transfer video data. The physical layer for TMDS is current mode logic (CML), DC coupled, and terminated to 3.3 V. As such, the ESD protection diodes should have a 3.3 V working voltage with low capacitance. The ESD102-U4 and ESD102-U2 products would also be ideal for DisplayPort and mini DisplayPort applications.

PTM Published on: 2014-04-10