TMDS261B datasheet(21/48 Pages) TI1

21 / 48 page

VSadj Resistance − k

Ω

200

400

600

800

1000

1200

1400

1600

G008

TA = 25°C

VCC = 3 V

VCC = 3.6 V

VCC = 3.3 V

Data+

Data–

Clk+

Clk–

Coax

SMA

AVCC

(4)

AVCC

TTP4

TTP2

TTP1

HDMI Cable

(1)

SMA

TTP3

Coax

SMA

Coax

SMA

Coax

SMA

Coax

Parallel

BERT

800-mVpp,

1000-mVpp,

1200-mVpp

Differential

Signal

With

Preemphasis

(3-dB, 120-ps

Duration

(5)

Eye Test

Instrument

(2, 3)

nnn

B0331-10

<2-inch

50-

Transmission Line

(6)

<2-inch

50-

Transmission Line

(6)

<2-inch

50-

Transmission Line

(6)

<2-inch

50-

Transmission Line

(6)

TMDS261B

OUT

+EQ

Eye Test

Instrument

(2, 3)

nnn

TMDS261B

www.ti.com

SLLS987A

– SEPTEMBER 2009 – REVISED JULY 2011

TYPICAL CHARACTERISTICS (continued)

AVCC = 3.3 V, RT = 50 Ω

DIFFERENTIAL OUTPUT VOLTAGE

RESISTANCE

Figure 23.

(1)

The HDMI cable between TTP1 and TTP2 is 0 m (no loss) case. See Figure 15 for the loss profile of the cable.

(2)

Eye data is measured using an 8-GHz bandwith oscilloscope (Agilent).

(3)

Eye data is taken at TTP4.

(4)

AVCC = 3.3 V; VSadj = 4.02 k

Ω.

(5)

RT = 50 Ω.

(6)

2 inches = 5,08 cm.

NOTES: Output edge rate default (fastest): input edge rate from the video pattern generator greater than 75 ps (20%

–80%).

The input signal from the parallel BERT has pre-emphasis. See Figure 26 for acceptable input pre-emphasis duration

and amplitude.

Pass/fail criterion: output eye at TTP4 should comply with output eye mask (See Figure 25). The input TMDS clock

frequencies tested: 25 MHz, 30.24 MHz, 36 MHz, 54 MHz, 65 MHz, 74.25 MHz, 84.75 MHz, 108 MHz, 135 MHz,

148.5 MHz, 185.625 MHz, 222.75 MHz, 297 MHz.

Figure 24. Input Pre-Emphasis Tolerance-Measurement Setup

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