MAX3815A 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3815A

TMDS Digital Video Equalizer for HDMI/DVI Cables

Maxim Integrated 

TMDS Digital Video Equalizer for

HDMI/DVI Cables

The loss-of-clock circuitry powers down the part when-

ever there is an absence of a clock signal. This mutes

the output and reduces power consumption to 83mW

whenever the input signal is removed. During power-

down, the MAX3815A’s TMDS output pins go to a high-

impedance state.

The CLKLOS is an open-collector output that requires a

resistive pullup to VCC for operation. The pullup resistor

range is 1kω to 10kω (see Figure 3).

Output Level Control (OUTLEVEL) Input

The OUTLEVEL pin is a three-state input that allows the

user to select between three output settings. Forcing this

pin high results in the standard output signal level with

no back terminations; leaving the pin open results in a

standard output swing with 267ω differential back termi-

nation resistors. Forcing this pin low results in one-half

standard output signal level.

Using Back Termination

Using back termination resistance improves signal integ-

rity through absorption of reflections. It also shifts the sin-

gle-ended output voltage high (VH) and low (VL). Table 1

shows the output voltages when using the MAX3815A in

each of its three output configurations.

Equalizer Control (EQCONTROL) Input

The EQCONTROL pin allows the user to control the

equalization in one of two ways: forcing the pin to ground

sets the equalizer in automatic equalization mode,

and forcing a voltage between VCC - 1V to VCC allows

manual control of the equalization level. Set to VCC for

maximum boost (long cable). Set to VCC - 1V for mini-

mum boost (short cable).

RX_IN+/-

Interface Models

MAX3815A

VCC

50Ω

Figure 5. Simplified Input Circuit Schematic

TRANSIENT

SUPRESSOR

CLAMP

MAX3815A

RX_OUT+

RX_OUT-

PWRDWN 0

1

10mA OUTLEVEL = HIGH

12.5mA OUTLEVEL = OPEN

5mA OUTLEVEL = LOW

Figure 6. Simplified Output Circuit Schematic

Table 1. Output Settings and Swings

OUTLEVEL

High

Open

Low

BACK TERMINATION

Open

267I

Open

DIFFERENTIAL

SWING (mVP-P)

1000

910

500

SINGLE-ENDED HIGH

(VH)

VCC

VCC - 85mV

VCC

SINGLE-ENDED LOW

(VL)

VCC - 500mV

VCC - 540mV

VCC - 250mV

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