Maxim公司的MAX3814 TMDS EQ/驱动器件能用来补偿DVI/HDMI传输连接器连接线FR-4和电缆所引起的损耗,提供完全兼容DVI/HDMI的输出,广泛应用便携式PC TMDS均衡器和驱动器,对接站(Docking Station)TMDS均衡器和驱动器以及电缆TMDS均衡器.本文介绍了MAX3814的主要性能,方框图,应用以及典型应用电路图和评估板电路与所用元器件.The MAX3814 TMDS® EQ/driver IC compensates for FR-4 andcable losses up to the DVI/HDMI transmit connector and provides afully compliant DVI/HDMI TMDS output. The device can also be usedin DVI/HDMI cable applications to extend reach and improve jittermargin of cable channels at the receive-side connector.The on-chip TMDS drivers operate at a standard current level forimplementing a typical DVI/HDMI nonback- terminated transmitter, aswell as a 50% higher current mode for using a 200ohmback termination resistor (nonmatching) to achieve a10dB return loss.Typical DVI/HDMI output drivers contribute to reflection problemsbetween the connector and a typical highimpedance (open) DVI/HDMITx output. The selectable output current (LEVEL pin) gives theoption of partial back termination (e.g., differentially connected200) to mitigate the reflection problem effectivelywhile keeping common-mode offset to a minimum.The 4-channel implementation treats all channels identically. Toallow board layout flexibility for DVI and HDMI connectors, whichhave different channel order, the clock and data channels can bearbitrarily assigned. The MAX3814 operates from a 3.3V powersupply, standard for DVI/HDMI applications, and is packaged in a5mm x 5mm x 0.1mm, 32-pin TQFP package.主要特性:_ Equalizes FR-4 Board Microstrip and Cable HF Losses Up to 15dB at825MHz for Operation at 0.25Gbps to 1.65Gbps_ Compatible with HDMI 1.3_ Less Than 0.2UIP-P Residual Jitter at 1.65Gbps for 0 to 15dBChannel Loss at 825MHz_ Input Terminations: 50(Each Side to VCC)±10%_ Output of Driver is a Fully DVI/HDMI TMDSCompatible CableDriver_ Output Amplitude: 1.05VP-P Differential_ Enable Pin to Select Normal Operation or Power-Down Mode_ LEVEL Pin to Select Output Current for Use With or Without BackTermination_ 32-Pin TQFP for Four Channels; Any Channel Can Be Either a TMDSData or Clock Signal_ VCC = 3.3V; Signal Pins Have Absolute Max Ratings of 5.5V (forFault Conditions)应用:Laptop PC TMDS Equalizer and DriverDocking Station TMDS Equalizer and DriverCable TMDS Equalizer图1:器件的功能方框图图2.典型应用电路图图3.系统应用方框图.图4.MAX3814应用方框图.下面是关于MAX3814的评估板(EVK):The MAX3814 evaluation kit (EV kit) simplifies evaluation of theMAX3814 TMDS equalizer/driver. This EV kit allows for quick testingof the MAX3814 with either a DVI or HDMI environment. The MAX3814EV kit is fully assembled and tested.下表是所用元件列表:
图5.MAX3814评估板(EVK)电路图
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