TMDS261B Datasheet, PDF (22/48 Pages) Texas Instruments – TWO-PORT HDMI SWITCH

TMDS261B
SLLS987A – SEPTEMBER 2009 – REVISED JULY 2011
AVCC = 3.3 V, R_T = 50 Ω
TYPICAL CHARACTERISTICS (continued)
780 mV
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200 mV
0
–200 mV
–780 mV
0
0.25 UI
0.75 UI
Figure 25. Output-Eye Mask at TTP4
Pre-emphasis
Duration
120 ps
3-dB Pre-emphasis Level
1.0 UI
M0146-01
80%
20%
20%
VOD p-p = 800 mV–1200 mV
Input Signal Rise Time (20–80%)
80%
Input Signal Fall Time (20–80%)
T0235-02
Figure 26. Acceptable Pre-Emphasis Into TMDS261B
Any input pre-emphasis higher than the input condition shown in Figure 26 can result in over-equalization and
potential system failure. During over-equalization, the TMDS261B in the setup of Figure 24 fails the output eye
mask as shown in Figure 25.
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