Quad HDMI Input Fast Switching Solution with ADV7612

In this application note from Analog Devices, learn how to implement a quad-input HDMI receiver using dual ADV7612 devices and an ADV7511 transmitter, focusing on fast switching, signal integrity, and reliable I2C control. It details bus management, tri-stating, trace routing, and termination strategies for video, audio, and line-locked clock signals, along with optional CEC and interrupt handling.

Application Note Overview

Used in HDMI video switching applications, multiplexed HDMI receivers require careful bus management, signal termination, and layout practices to ensure fast switching, signal integrity, and reliable communication. This application note from Analog Devices explains the principles of using dual ADV7612 receivers to implement a quad-input HDMI solution, detailing tri-stating, I2C control, bus loading, and proper termination of video, audio, and line-locked clock (LLC) signals.

Download this application note to learn how to configure dual ADV7612 devices with an ADV7511 transmitter, including series and symmetrical termination resistor selection, equal-length trace routing, I2C address management, and clocking strategies using XTAL_N/XTAL_P or shared oscillator signals. The guide also covers practical board layout considerations, optimal routing for pixel, audio, and LLC lines.

The note further addresses testing and signal verification, including eye diagram measurements and scope captures to validate signal swings, minimize overshoot and undershoot, and ensure clean HDMI transmission. By following these techniques, designers can achieve fast, reliable HDMI input switching with four multiplexed channels, reduced signal degradation, and simplified integration into high-performance video systems.