MAX3814 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3814

DVI/HDMI TMDS FR-4 and Cable Equalizer/Driver

Maxim Integrated 

DVI/HDMI TMDS FR-4 and

Cable Equalizer/Driver

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 200Ω 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 100Ω differential transmission line

impedance into and out of the MAX3814.

• To minimize possible reflections, choose the

200Ω 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.

Typical Application Circuits

GRAPHICS

BOARD

ASIC

LAPTOP

CMOS

ROUTING

SWITCH

MAX3814

50Ω

3.3V

200Ω

MXM

CONNECTOR

50Ω

3.3V

DOCKING

CONNECTOR

DOCK

MAX3814

50Ω

3.3V

200Ω

EXTERNAL DVI/HDMI

CABLE

REMOTE DISPLAY

MAX3814

50Ω

3.3V

200Ω

50Ω

3.3V

ASIC

50Ω

50Ω

50Ω

3.3V

3.3V

3.3V

DVI/HDMI

DVI/HDMI

CONNECTOR CONNECTOR

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