1. 概述
LT8641SXE是一個(gè)最小化轉(zhuǎn)換差分信號(hào)（TMDS）開(kāi)關(guān)，能夠?qū)⒍鄠€(gè)高清多媒體接口（HDMI）源設(shè)備連接到高清電視（HDTV）。LT8641SXE基于HDMI 1.4規(guī)范，是一種高級(jí)TMDS開(kāi)關(guān)，為制造商提供了一種經(jīng)濟(jì)高效的方法，可以在其HDTV中添加其他HDMI端口。多個(gè)HDMI端口允許消費(fèi)者將各種支持HDMI的信號(hào)源連接到其HDTV。它支持HDCP 1.4規(guī)格和音頻回傳通道功能。
LT8641SXE是一款四對(duì)一（4：1）開(kāi)關(guān)，非常適合在HDTV和A / V接收器的背面板上使用，從而使消費(fèi)者可以連接多個(gè)具有HDMI功能的設(shè)備，例如高清DVD播放器，機(jī)頂盒。盒和游戲機(jī)。LT8641SXE開(kāi)關(guān)從四個(gè)接收器端口中選擇一個(gè)HDMI或數(shù)字視頻接口（DVI）信號(hào)，并生成HDMI / DVI音頻/視頻輸出以及DDC / HPD切換，完全符合HDMI和DVI規(guī)范。LT8641SXE還用作HDMI接收器。它從HDMI數(shù)據(jù)包中提取數(shù)字音頻信息，并將數(shù)字音頻恢復(fù)到I2S / SPDIF接口。因此可以將其應(yīng)用于多聲道音頻放大器以獲得最佳音頻效果。

2. 2.功能
?4輸入1輸出HDMI2.0鏈路
?兼容HDMI1.4和HDCP1.4 
?HDMI輸入分辨率高達(dá)4Kx2K @ 30Hz 
?HDMI輸出分辨率高達(dá)4Kx2K @ 30Hz 
?音頻輸出支持8通道I2S音頻輸出或6通道I2S和SPDIF都
支持?支持3D格式
?支持CEC 
?支持HDMI鏈接上的一個(gè)通道ARC功能。

3.應(yīng)用圖
?嵌入式電視開(kāi)關(guān)
?外部HDMI開(kāi)關(guān)
?數(shù)字音頻放大器

The LT8641SXE is a Transition Minimized Differential Signaling (TMDS) switch that enables the connection of multiple High-Definition Multimedia Interface (HDMI) source devices to high-definition television (HDTV). Based on the HDMI 1.4 specification, LT8641SXE is an advanced TMDS switch that delivers a cost-effective method for manufacturers to add additional HDMI ports to their HDTV. Multiple HDMI ports allow consumers to connect variety HDMI-enabled sources to their HDTV. It supports HDCP 1.4 specifications, and Audio Return Channel function.

The LT8641SXE is a four-to-one (4:1) switch ideally suited for use in the back panel of HDTV and A/V receivers, allowing consumers to connect multiple HDMI-enabled devices such as high-definition DVD players, set top boxes and game consoles. The LT8641SXE switch selects a single HDMI or Digital Visual Interface (DVI) signal from the four receiver ports and generates HDMI/DVI audio/video output, as well as DDC/HPD switching, in full compliance with the HDMI and DVI specifications. The LT8641SXE also acts as a HDMI receiver. It extracts the digital audio information from the HDMI packet, and recovers digital audio to I2S/SPDIF interface. So it can be applied to the multi-channel audio amplifier for best audio effect. This feature can enable an external HDMI switching box acts as a home entertainment box that can output up to 8-channel high quality audio signal for the best audio effect.

To improve the performance in the case of long distance transmission, pre-emphasized driver is integrated into the chip. This pre-distortion technique compensates the transmission loss. The chip provides a Clock Data Recovery (CDR) path to enhance the performance. This path uses Re-Sample and Re-Drive architecture which re-samples data at the receiver side and re-drive data at the transmitter side. It will not pass through noise from inputs to output and hence provides reliable transmission.

The chip also employs an advanced on-die-termination calibrating circuitry.  The input termination is able to be automatically adjusted.  The integrated HPD switch as well as DDC switch lower the cost of system manufacture, and simplify the routing on the system board.

2. Features

? HDMI output resolution support up to 4Kx2K@30Hz and 4Kx2K @60Hz YCbCr 4:2:0 format
? Compliant with HDMI1.4/2.0 and HDCP1.4
? HDMI input resolution support up to 4Kx2K@30Hz and 4Kx2K @60Hz YCbCr 4:2:0 format
? Support 8 channel I2S audio outputs or both 6-channel I2S and SPDIF
? Supports 3D format
? Supports CEC

? Supports one channel ARC function on HDMI link.

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