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ISL54105 Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL54105 Datasheet(HTML) 10 Page - Intersil Corporation |
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10 / 16 page  10 FN6723.0 June 11, 2008 Next, a 15m DualLink DVI cable was attached and terminated into a female TPA2 adapter and the eye captured in Figure 4. The eye is not meeting the minimum requirements of either the HDMI or DVI standards and the Dell Monitor is unable to recover the data and display an image. Setup B inserts an ISL54105 and an additional 15m cable between the pattern generator and the monitor: Given the input signal shown in Figure 4, the ISL54105’s TMDS output signal (Figure 6) is extremely clean. The output is an improvement over the original signal coming from the pattern generator in both amplitude and jitter. The cleaner signal generated at the output of the ISL54105 results in an improved eye at the end of another 15m cable (Figure 7). The eye is open enough that the Dell 2000FP can now display a UXGA image with no visible sparkle or other artifacts. Tx Loading Considerations When the ISL54105 is powered-up and its Tx outputs are disabled, via either the PD (power-down) pin, the power-down register bit (register 0x02[5]), or the tri-state outputs bits (register 0x05[1:0]), the Tx pins are high impedance. In this state, they will draw no current from the Rx pins of any TMDS receiver they may be connected to. However, if power to the ISL54105 is removed, the Tx pins are no longer high-impedance. Figure 8 shows the relevant equivalent circuit, including the internal ESD protection diodes. For simplicity, only one of the eight Tx outputs, ESD protection diodes, and Rx termination resistors are shown. When VD to the ISL54105 drops below ~2.7V and power is applied to the external TMDS receiver, ESD protection diodes inside the ISL54105 can become forward-biased, FIGURE 4. CHROMA EYE DIAGRAM AFTER 15m CABLE CHROMA 2326 VIDEO PATTERN GENERATOR 15m DUAL-LINK DVI CABLE DELL 2000FP UXGA MONITOR ISL54105 15m DUAL-LINK DVI CABLE FIGURE 5. TEST SETUP B FIGURE 6 FIGURE 3 FIGURE 4 FIGURE 7 FIGURE 6. EYE DIAGRAM AT OUTPUT OF ISL54105 FIGURE 7. ISL54105 EYE DIAGRAM AFTER 15m CABLE ISL54105 |
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