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

Detailed Description

The MAX3814 TMDS equalizer/driver accepts differential

CML input data rates from 250Mbps to 1.65Gbps. It con-

sists of four differential CML input buffers, four indepen-

dent fixed equalizers, four limiting amplifiers, and four

differential CML output buffers (Figure 1). The MAX3814

functions both as an equalizer and as a driver.

As an equalizer the MAX3814 automatically adjusts for

attenuation levels up to 16dB at 825MHz from either

dielectric board losses or skin-effect losses in copper

cable.

As a driver the MAX3814 provides CML outputs. The

CML output is normally open (i.e., no back termination)

and is DC-coupled by transmission line to a termination

at the far end per DVI/HDMI standards. The MAX3814

provides nominally 10mA output-switching currents.

However, with the MAX3814, there is a selectable higher

current drive to accommodate a differential 200Ω back

termination resistor while maintaining the differential

swing of 1000mVP-P. This 200Ω back termination resistor

serves to dampen signal reflections returning to the

device from discontinuities in the channel such as DVI or

HDMI connectors, providing a 10dB return loss. See the

CML Inputs and Outputs section for more information.

TERMINATED

TO VCC

INA+/-

EQUALIZER

TERMINATED

TO VCC

INB+/-

EQUALIZER

TERMINATED

TO VCC

INC+/-

EQUALIZER

TERMINATED

TO VCC

IND+/-

EQUALIZER

MAX3814

Figure 1. Functional Diagram

LIMITING

AMPLIFIER

LIMITING

AMPLIFIER

LIMITING

AMPLIFIER

DRIVER

DRIVER

DRIVER

OUTA+/-

OUTB+/-

OUTC+/-

LIMITING

AMPLIFIER

DRIVER

LEVEL

OUTPUT LEVEL CONTROL

OUTD+/-

ENABLE

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