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LM1291N Scheda tecnica(PDF) 7 Page - National Semiconductor (TI) |
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LM1291N Scheda tecnica(HTML) 7 Page - National Semiconductor (TI) |
7 / 12 page Application Hints (Continued) 3 Video mute Numerous designs require video blanking during scanning mode transitions The LM1291 provides an active-low pulse at pin 3 when triggered by a step change of H sync frequen- cy from f1 to f2 The pulse width is controlled by the time constants set up through capacitors CFVC2 and CFVC1 at pins 25 and 26 respectively For CFVC2 t 3 c CFVC1 the pulse width is approximately 40 c 103 c CFVC2 c ln lf2 b f1l 213 c 103 J seconds Many sync sources fail to exhibit a clean step change of H sync frequency during scanning mode transitions For this reason in most applications a pulse smoothing circuit is needed at pin 3 Typically a 22 mF cap to ground is used in conjunction with a 100 kX pull-up resistor See Figure 16 The resulting pulse has a slow rise time at the trailing edge which extends the effective mute duration slightly InputOutput Schematics TLH12323 – 4 FIGURE 4 TLH12323 – 5 FIGURE 5 TLH12323 – 6 FIGURE 6 7 |
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