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TMDS341APFC датащи(PDF) 23 Page - Texas Instruments |
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TMDS341APFC датащи(HTML) 23 Page - Texas Instruments |
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23 / 27 page ![]() www.ti.com TMDS341A SLLS702B – MAY 2006 – REVISED MARCH 2007 APPLICATION INFORMATION (continued) Table 2 summarizes the recommended cable lengths based on threshold voltages VIH = 0.7 VDD and VIL = 0.3 VDD. Table 2. Recommended Cable Lengths Under General Threshold Voltages, 0.7 VDD and 0.3 VDD, of a DDC Interface DDC THRESHOLD VOLTAGE, VIH = 0.7 VDD, VIL = 0.3 VDD TOTAL CABLE LENGTH (m) SUGGESTED PULL-UP RESISTANCE (k Ω) CABLE TYPE SWITCH BOX Lcable1 + Lcable2 DIGITAL DISPLAY Lcable 28-AWG DVI 11 11 Rupsource = 1.5 kΩ Rupsink = 47 kΩ 28-AWG HDMI 17 17 Applying the same methodology to the case of VIH = 1.9 V and VIL = 0.7 V, Table 3 summarizes the recommended cable lengths to meet the timing requirement of the DDC interface. Table 3. Recommended Cable Lengths Under General Threshold Voltages, 1.9 V and 0.7 V, of a DDC Interface DDC THRESHOLD VOLTAGE, VIH = 1.9 V, VIL = 0.7 V TOTAL CABLE LENGTH (m) SUGGESTED PULL-UP RESISTANCE (k Ω) CABLE TYPE SWITCH BOX Lcable1 + Lcable2 DIGITAL DISPLAY Lcable 28-AWG DVI 16 16 Rupsource = 1.5 kΩ Rupsink = 47 kΩ 28-AWG HDMI 24 24 23 Submit Documentation Feedback |
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