原标题：ADI ADV7630 HDMI4：1多路转换输入、HDMI1：2分离器评估参考设计

　　ADI公司的ADV7630是一款高质量、具有4:1输入多路复用器的1:2 HDMI分离器。它包含了一个四输入HDMI接收机和双发射机功能的集成芯片。ADV7630芯片支持所有强制性HDMI 3D电视格式,1080P高清格式达每像素36位深颜色,显示器分辨率高达1080P。HDCP加密视频接收也支持接收来自TMDS HDMI视频传输的视频数据流。HDMI输出特性专注于HDCP加密引擎的DDC数据流。这款ADV7630集成了一个具有发现和控制特性的HDMI CEC控制器。本文主要介绍ADV7630芯片的主要特性、应用方向及芯片内部结构图，并介绍评估板的电路板图、电路原理图和PCB元件布局图。

　　The ADV7630 is a high quality 1:2 HDMI® splitter with 4:1 input multiplexer. It incorporates a four-input HDMI receiver and dual transmitter functions onto a single chip. The ADV7630 supports all mandatory HDMI 3D TV formats, HDTV formats up to 1080p 36-bits per pixel Deep Color, and display resolutions up to 1080p60. The reception of HDCP encrypted video is also supported by the HDMI receiver with TMDS The HDMI video transmitted to the downstream device by the transmitter. HDMI output features dedicated DDC lines with an HDCP encryption engine.

　　The ADV7630 integrates an HDMI CEC controller that supports the capability discovery and control (CDC) feature.

　　The ADV7630 incorporates XpressView™ fast switching on all input HDMI ports. Using an Analog Devices, Inc., hardware-based HDCP engine that minimizes software overhead, XpressView technology allows fast switching between all HDMI input ports in less than 1 second.

　　Each HDMI input port has dedicated 5 V detect and hot plug assert pins. The HDMI receiver also includes an integrated equalizer that ensures robust operation of the interface even with long and low quality cables. Each HDMI has a dedicated hot plug detect port and DDC lines along with an internal HDCP encryption engine.

　　The ADV7630 features an EDID replicator and internal EDID RAM. On the transmitter side, DDC control allows reading back EDID data from sink. As the part incorporates an internal regulator, the EDID functionality on the receiver’s side can be powered from the HDMI cable when ac power is removed from the system.

　　Fabricated in an advanced CMOS process, the ADV7630 is provided in a 14 mm × 14 mm, 128-lead surface-mount TQFP_EP, RoHS-compliant package and is specified over the 0°C to 70°C temperature range.

　　ADV7630主要特性：

　　2.25 GHz TMDS HDMI 1:2 splitter with 4:1 input mux

　　High-Definition Multimedia Interface (HDMI) supported

　　All mandatory and additional 3D video formats supported

　　CEC 1.4-compatible

　　225 MHz maximum TMDS clock frequency

　　XpressView fast switching on all HDMI input ports

　　36-/30-bit per pixel Deep Color and 24-bit per pixel color support

　　High-bandwidth Digital Content Protection (HDCP) 1.4 support with internal HDCP keys

　　HDCP repeater support

　　Up to 127 KSVs supported

　　Integrated CEC controller

　　5 V detect and hot plug assert for each HDMI port

　　EDID data extraction on HDMI outputs

　　Hot plug detection (HPD) input on HDMI outputs

　　Interrupt controller with interrupt output

　　On-chip 5 V regulator for 5 V HDMI cable power support

　　Software libraries, driver, and application available

　　Internal EDID RAM

　　128-lead 14 mm × 14 mm TQFP_EP package

　　ADV7630应用方向：

　　Video conferencing

　　HDTV

　　AVR, HTiB

　　Soundbar

　　Video switch

　　HDMI splitter

　　图1. ADV7630内部方框图

　　ADV7630评估板图

　　图2. ADV7630评估板图

　　ADV7630评估板原理图

　　图3.ADV7630评估板原理图

　　图4.ADV7630评估板原理图

　　图5.ADV7630评估板原理图

　　图6.ADV7630评估板原理图