Data+

Data-

Clk+

Clk-

Video

Pattern

Generator

600mVpp

Coax

Coax

Coax

Coax

Coax

Coax

Coax

Coax

SMA

GND

Jitter Test

Instrument

TTP1

RX

+ EQ

OUT

Jitter Test

Instrument

SMA

SMA

SMA

13”

5”

RT = 50 W

GND

SMA

SMA

SMA

SMA

SN75DP120

TTP2

TTP3

TTP4

RX

OUT

+ EQ

0

10

20

30

40

50

60

70

0

5

10

15

20

25

InputTraceLength(inches)[width=4mil]

1.62Gbps,400mVpp,3.5dB

1.62Gbps,400mVpp,6dB

1.62Gbps,400mVpp,9.5dB

1.62Gbps,800mVpp,0dB

2.7Gbps,400mVpp,0dB

2.7Gbps,400mVpp,3.5dB

2.7Gbps,400mVpp,6dB

2.7Gbps,400mVpp,9.5dB

2.7Gbps,800mVpp,0dB

1.62Gbps,400mVpp,0dB

SN75DP120

www.ti.com

SLLSE08 – OCTOBER 2009

(1)

All jitter measured at BER of 10-e9.

(2)

Residual jitter reflects the total jitter measured at TTP4 minus the jitter at TTP1.

(3)

Input trace of 13 inches represents 6 inches trace, connector, and additional 6 inches of trace.

(4)

Output trace of 5 inches represents 2 inches of trace, connector, and 2 inches of trace.

(5)

Input edge rate from Video Pattern Generator is 50ps (20%–80%) with output level 600mVpp.

(6)

CAD_SINK is H and DP120 output levels are set to 600mVp-p level.

Figure 12. Jitter Measurement Setup – TMDS Mode

TYPICAL CHARACTERISTICS

Figure 13. Output Jitter vs Input Trace Length

Copyright © 2009, Texas Instruments Incorporated

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