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    LT8621SXE-M
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    1. Description


    The LT8621SXE-M is a fully integrated HDMI 1.4 switch that enables the connection of two High-Definition Multimedia Interface (HDMI) source devices to a remote high-definition television (HDTV). The SPDIF digital audio output allows customers connect an audio amplifier for better audio quality and control. Based on the HDMI version 1.4, equipped with adaptive equalization of wide range,  LT8621SXE-M is an advanced TMDS switch that delivers a cost-effective method for HDMI signal repeating, switching and audio extraction. . With support of HDCP version 1.4 specifications, if used in pairs, it can provide a very low cost effective HDMI signal extension solution with CAT6 cable with bandwidth up to 3Gb/s.
    The LT8621SXE-M is integrated with a MCU for chip programming and EDID processing. The two HDMI ports can be designed as two HDMI connector ports or designed as RJ45 connector ports for CAT6 cable HDMI extension. The LT8621SXE-M also acts as a HDMI receiver. It extracts the digital audio information from the HDMI packet, and recovers digital audio to IIS/SPDIF interface. This feature can enable an external HDMI switching box acts as a home entertainment box that can output up to 2-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

    • 2 input 1 output HDMI 1.4 switch, with TMDS signal repeater
    • Support HDCP 1.4
    • HDMI resolution up to 4K x 2K@30Hz, 4KX2K@60Hz(YCbCr 4:2:0)
    • Support HDMI signal repeating through HDMI cable and CAT6 cable
    • Support digital audio out that allow direct audio amplifier connection
    • Support 3D format
    • 9mm x 9mm 76-pin QFN package

    3. Application

     Long HDMI signal repeating with HDMI cable or CAT6 cable, with optional audio output.

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