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Data +

Data −

Clk+

Clk−

Video Patterm

Generator

1000 mVpp

Differential

Coax

Coax

Coax

Coax

Coax

Coax

Coax

Coax

<2” 50

Ω

Transmission Line

5m 28AWG

HDMI Cable

TMDS341A

RX

+

EQ

M

U

X

OUT

0dB

RX

+

EQ

M

U

X

OUT

0dB

<2” 50

Ω

Transmission Line

<2” 50

Ω

Transmission Line

<2” 50

Ω

Transmission Line

SMA

SMA

SMA

SMA

SMA

SMA

SMA

SMA

AVcc

RT

RT

AVcc

RT

RT

Jitter Test

Instrument

Jitter Test

Instrument

TP3

TP2

TP1

TMDS341 input equalization gain vs. 5m DVI/HDMI cable response

−18

−16

−14

−12

−10

−8

−6

−4

−2

0

0

200

400

600

800

1000 1200 1400 1600 1800 2000

f − Frequency − MHz

Inversed TMDS341 EQ Gain

28 AWG 5m HDMI Cable

28 AWG 5m DVI Cable

TMDS341A

SLLS702B – MAY 2006 – REVISED MARCH 2007

PARAMETER MEASUREMENT INFORMATION (continued)

A.

B.

The residual jitter reflects the total jitter measured at the TMDS341A output, TP3, subtract the total jitter from the

signal generator, TP1

Figure 8. Jitter Test Circuit

Figure 9 shows the frequency loss response from a 5m 28AWG HDMI cable and a 5m 28AWG DVI cable. The

TMDS341A built-in passive input equalizer compensates for ISI. For an 8-dB loss HDMI cable, the TMDS341A

typically reduces jitter by 60 ps from the device input to the device output.

Figure 9. S-Parameter Plots of 5-m DVI and HDMI Cables

13

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