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MAX3815ACCM+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3815ACCM+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 11 page TMDS Digital Video Equalizer for HDMI/DVI Cables _______________________________________________________________________________________ 7 Detailed Description The MAX3815A TMDS equalizer accepts differential CML input data at rates of 250Mbps up to 2.25Gbps (individual channel data rate). It automatically adjusts to skin-effect losses in copper cable. It consists of four CML input buffers, a loss-of-clock signal detector, three independent adaptive equalizers, four limiting amplifiers, and four output buffers (Figure 1). CML Input Buffers and Output Drivers The input buffers and the output drivers are implemented using current-mode logic (CML) (see Figures 4 and 5). The output drivers are open-collector and can be turned off with the OUTON pin. The OUTLEVEL pin sets the output drive current to one of three levels; see the Applications Information and Pin Description sections for more infor- mation. For details on interfacing with CML, refer to Application Note 291: HFAN-01.0: Introduction to LVDS, PECL, and CML. Loss-of-Clock Signal Detector The loss-of-clock signal detector indicates a loss-of- clock signal at the CLKLOS pin. This is an open-collector output that must be connected to VCC through a 4.7kω external pullup. This resistor is required whether or not the LOS output is used. Adaptive Equalizer The three data channels each contain an independent adaptive equalizer. Each channel analyzes the incom- ing signal and determines the amount of equalization to apply. Limiting Amplifier The limiting amplifier amplifies the signal from the adap- tive equalizer and truncates the top and bottom of the waveform to provide a clean high- and low-level signal to the output drivers. Figure 1. Functional Diagram INPUT BUFFER DRIVER ADAPTIVE EQ LIMITING AMPLIFIER TERMINATED 3.3V CML INPUT BUFFER DRIVER ADAPTIVE EQ LIMITING AMPLIFIER TERMINATED 3.3V CML INPUT BUFFER DRIVER ADAPTIVE EQ LIMITING AMPLIFIER TERMINATED 3.3V CML INPUT BUFFER DRIVER LIMITING AMPLIFIER TERMINATED 3.3V CML RXC_OUT+/- OUTLEVEL RX2_OUT+/- RX1_OUT+/- RX0_OUT+/- RX0_IN+/- RX1_IN+/- RX2_IN+/- RXC_IN+/- CLKLOS EQCONTROL OUTON CLOCK LOS DETECTOR MAX3815A |
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