The differential trace impedance of HDMI is specified at 100Ω±15% in Test ID 8-8 in HDMI Compliance Test Specification Rev.1.2a and 1.3a. Rev. 1.3a has a more relaxed specification which allows an occurrence of a single excursion out to a max/min of 100Ω±25% and of a duration less than 250ps. General PCB knowledge (PCB Prepreg Selection, Critical Signal Trace Length and Microstrip Stub Effect) and impedance control on 4-layer PCB of 1080+2116 Prepreg will be discussed in this layout guideline.

This application note provides guidelines for successful PCB layout techniques for Fairchild's FSHDMI311 DVI/HDMI Repeater. For additional information rewiev the FSHDMI311 datasheet. The FSHDMI311 features one HDMI input port and one HDMI output port. It re-transmits the high-speed TDMS signals and the low speed DDC signals. This guide discusses the PCB placement and routing off all critical components in order of important. In addition to the FSHDMI311 -specific recommendations listed here, common high-speed layout techniques shoul be also used.