1. 概述
LT8641SXE是一個最小化轉換差分信號（TMDS）開關，能夠將多個高清多媒體接口（HDMI）源設備連接到高清電視（HDTV）。LT8641SXE基于HDMI 1.4規范，是一種高級TMDS開關，為制造商提供了一種經濟高效的方法，可以在其HDTV中添加其他HDMI端口。多個HDMI端口允許消費者將各種支持HDMI的信號源連接到其HDTV。它支持HDCP 1.4規格和音頻回傳通道功能。
LT8641SXE是一款四對一（4：1）開關，非常適合在HDTV和A / V接收器的背面板上使用，從而使消費者可以連接多個具有HDMI功能的設備，例如高清DVD播放器，機頂盒。盒和游戲機。LT8641SXE開關從四個接收器端口中選擇一個HDMI或數字視頻接口（DVI）信號，并生成HDMI / DVI音頻/視頻輸出以及DDC / HPD切換，完全符合HDMI和DVI規范。LT8641SXE還用作HDMI接收器。它從HDMI數據包中提取數字音頻信息，并將數字音頻恢復到I2S / SPDIF接口。因此可以將其應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4Kx2K @ 30Hz 
?HDMI輸出分辨率高達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鏈接上的一個通道ARC功能。

3.應用圖
?嵌入式電視開關
?外部HDMI開關
?數字音頻放大器

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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