Maxim公司的MAX3814 TMDS EQ/驅動器件能用來補償DVI/HDMI傳輸連接器連接線FR-4和電纜所引起的損耗,提供完全兼容DVI/HDMI的輸出,廣泛應用便攜式PC TMDS均衡器和驅動器,對接站(Docking Station)TMDS均衡器和驅動器以及電纜TMDS均衡器.本文介紹了MAX3814的主要性能,方框圖,應用以及典型應用電路圖和評估板電路與所用元器件.
The MAX3814 TMDS® EQ/driver IC compensates for FR-4 and cable losses up to the DVI/HDMI transmit connector and provides a fully compliant DVI/HDMI TMDS output. The device can also be used in DVI/HDMI cable applications to extend reach and improve jitter margin of cable channels at the receive-side connector.
The on-chip TMDS drivers operate at a standard current level for implementing a typical DVI/HDMI nonback- terminated transmitter, as well as a 50% higher current mode for using a 200 ohmback termination resistor (nonmatching) to achieve a 10dB return loss.
Typical DVI/HDMI output drivers contribute to reflection problems between the connector and a typical highimpedance (open) DVI/HDMI Tx output. The selectable output current (LEVEL pin) gives the option of partial back termination (e.g., differentially connected 200) to mitigate the reflection problem effectively while keeping common-mode offset to a minimum.
The 4-channel implementation treats all channels identically. To allow board layout flexibility for DVI and HDMI connectors, which have different channel order, the clock and data channels can be arbitrarily assigned. The MAX3814 operates from a 3.3V power supply, standard for DVI/HDMI applications, and is packaged in a 5mm 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 at 825MHz 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 15dB Channel Loss at 825MHz
_ Input Terminations: 50(Each Side to VCC) ±10%
_ Output of Driver is a Fully DVI/HDMI TMDSCompatible Cable Driver
_ 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 Back Termination
_ 32-Pin TQFP for Four Channels; Any Channel Can Be Either a TMDS Data or Clock Signal
_ VCC = 3.3V; Signal Pins Have Absolute Max Ratings of 5.5V (for Fault Conditions)
應用:
Laptop PC TMDS Equalizer and Driver
Docking Station TMDS Equalizer and Driver
Cable TMDS Equalizer
圖1:器件的功能方框圖
圖2.典型應用電路圖
圖3.系統應用方框圖.
圖4.MAX3814應用方框圖.
下面是關于MAX3814的評估板(EVK):
The MAX3814 evaluation kit (EV kit) simplifies evaluation of the MAX3814 TMDS equalizer/driver. This EV kit allows for quick testing of the MAX3814 with either a DVI or HDMI environment. The MAX3814 EV kit is fully assembled and tested.
下表是所用元件列表:
圖5.MAX3814評估板(EVK)電路圖
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