MAX3814 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3814

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

Maxim Integrated 

TRANSIENT

SUPRESSOR

CLAMP

DVI/HDMI TMDS FR-4 and

Cable Equalizer/Driver

VT

50Ω

50Ω

OUT_+

OUT_-

200Ω

BACK TERMINATION

LEVEL,

ENABLE

INPUTS

44kΩ

VCC

44kΩ

ENABLE = HIGH

10mA

LEVEL = LOW

5mA

88kΩ

TRANSIENT

SUPRESSOR

CLAMP

50kΩ

Figure 4. Simplified Output Circuit with Back Termination

Resistor

Figure 5. Simplified Input Circuitry for Output Level (LEVEL)

and Enable (ENABLE) Control

Output Enable Control

The ENABLE pin is an LVTTL input that allows the user

to shut off the output-collector currents, thereby reduc-

ing power consumption of the device. Forcing this pin

high turns the output currents off; forcing this pin low

(normal operation) turns the currents on.

Figure 5 shows a simplified circuit for both the output

and enable controls.

Applications Information

Figure 6a shows a typical TMDS channel from a graph-

ics board of a laptop computer to a remote display.

Maintaining a 100Ω differential impedance for this

channel has its challenges. Besides proper board lay-

out of traces, there are multiple reflection points (A to

H). For example, at interface F in Figure 6a, a circular

arrow shows a reflection at the connector of a remote

display. When these reflections hit another interface,

they reflect again and thus become echoes corrupting

the incident signal. In Figure 6b, the MAX3814 is used

to equalize losses, isolate reflections, and redrive the

transmission line with high fidelity.

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