1. 概述
LT8641SXE是一个最小化转换差分信号（TMDS）开关，能够将多个高清多媒体接口（HDMI）源设备连接到高清电视（HDTV）。LT8641SXE基于HDMI 1.4规范，是一种高级TMDS开关，为制造商提供了一种经济高效的方法，可以在其HDTV中添加其他HDMI端口。多个HDMI端口允许消费者将各种支持HDMI的信号源连接到其HDTV。它支持HDCP 1.4规格和音频回传通道功能。
LT8641SXE是一款四对一（4：1）开关，非常适合在HDTV和A / V接收器的背面板上使用，从而使消费者可以连接多个具有HDMI功能的设备，例如高清DVD播放器，机顶盒。盒和游戏机。LT8641SXE开关从四个接收器端口中选择一个HDMI或数字视频接口（DVI）信号，并生成HDMI / DVI音频/视频输出以及DDC / HPD切换，完全符合HDMI和DVI规范。LT8641SXE还用作HDMI接收器。它从HDMI数据包中提取数字音频信息，并将数字音频恢复到I2S / SPDIF接口。因此可以将其应用于多声道音频放大器以获得最佳音频效果。

2. 2.功能
•4输入1输出HDMI2.0链路
•兼容HDMI1.4和HDCP1.4 
•HDMI输入分辨率高达4Kx2K @ 30Hz 
•HDMI输出分辨率高达4Kx2K @ 30Hz 
•音频输出支持8通道I2S音频输出或6通道I2S和SPDIF都
支持•支持3D格式
•支持CEC 
•支持HDMI链接上的一个通道ARC功能。

3.应用图
•嵌入式电视开关
•外部HDMI开关
•数字音频放大器

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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