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MAX3814CHJ+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3814CHJ+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 15 page Cable TMDS Equalizer The MAX3814 is useful in providing equalization for cables losses at location ZZ, at the input DVI/HDMI connector of the remote display. It can equalize cable lengths of 15 meters of 26 AWG wire and 12 meters of 28 AWG wire. Again, the 200 Ω resistor placed at the output of the MAX3814 absorbs reflections from the imperfect termination of the ASIC or imperfect transmis- sion-line interconnect. Layout Considerations The TMDS CML inputs are the most critical paths for the MAX3814 and great care should be taken to mini- mize discontinuities on these transmission lines between the connector and the IC. Here are some sug- gestions for maximizing the performance of the MAX3814. • The data and clock inputs should be wired direct- ly between the cable connector and IC without stubs. • The 4-channel implementation treats all channels identically. Input and output data channel designa- tions are only a guide. Polarity assignments can be swapped and channel paths can be interchanged. • An uninterrupted ground plane should be posi- tioned beneath the high-speed I/Os. • Ground-path vias should be placed close to the IC and the input/output interfaces to allow a return current path to the IC and the DVI and HDMI inputs. • Maintain a 100 Ω differential transmission line impedance into and out of the MAX3814. • To minimize possible reflections, choose the 200 Ω back termination option. Place this resistor as close to the MAX3814 as possible. • Use good high-frequency layout techniques and multilayer boards with an uninterrupted ground plane to minimize EMI and crosstalk. Refer to the schematic and board layers of the MAX3814EVKIT. DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver ______________________________________________________________________________________ 11 LAPTOP DOCK EXTERNAL DVI/HDMI CABLE DVI/HDMI CONNECTOR DVI/HDMI CONNECTOR MXM CONNECTOR DOCKING CONNECTOR REMOTE DISPLAY GRAPHICS BOARD ASIC ASIC 200 Ω 50 Ω 3.3V 50 Ω 3.3V 50 Ω 3.3V 50 Ω 3.3V 50 Ω 3.3V 50 Ω 3.3V 200 Ω CMOS ROUTING SWITCH 50 Ω 3.3V 50 Ω 3.3V 200 Ω MAX3814 MAX3814 MAX3814 Typical Application Circuits |
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