MAX3814 データシートの表示（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

CML Inputs and Outputs

The input buffers and the output drivers are current-

mode logic (CML). See Figures 2, 3, and 4.

The input buffers consist of a 50Ω load resistor connected

to VCC and the input connected to a differential equalizer.

The output drivers are open-collector. The current in

these outputs can be adjusted to 10mA or 15mA with

the control pin LEVEL. For 10mA operation, each open-

collector output drives through a transmission line to a

50Ω pullup of the next stage, as shown in Figure 3. For

recommended 15mA operation, the two outputs are

bridged by an external 200Ω back termination resistor

that is subsequently pulled up by a 50Ω resistor of the

next stage, as shown in Figure 4. The ESD structure per-

mits signals to achieve 5.5V absolute maximum ratings,

high common-mode range, and compatibility to HDMI

testing. The back termination resistor should be placed

as close as possible to the MAX3814 in the layout.

The ESD protection for both the input and output cir-

cuitry consists of diodes connected to a transient volt-

age suppressor clamp shown as a Schottky diode in

Figures 2, 3, and 4. For more information about the

function of the suppressor clamp, refer to the Detailed

Description section of the MAX3208E data sheet

(www.maxim-ic.com/MAX3208E).

TRANSIENT VCC

SUPRESSOR

CLAMP 50Ω

IN_+

TRANSIENT

SUPRESSOR

CLAMP

VT

50Ω

50Ω

OUT_+

OUT_-

+

TRANSIENT VCC

SUPRESSOR

CLAMP 50Ω

-

EQUALIZER

ENABLE = HIGH

LEVEL = LOW

IN_-

10mA

5mA

Figure 2. Simplified Input Circuit

Figure 3. Simplified Output Circuit Without Back Termination

Resistor

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