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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CGS410 датащи(PDF) 12 Page - National Semiconductor (TI) |
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CGS410 датащи(HTML) 12 Page - National Semiconductor (TI) |
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12 / 18 page  30 Circuit Operation (Continued) TLF11919 – 14 FIGURE 3-12 Serial Interface Example TLF11919 – 15 FIGURE 3-13 Minimum Cost k80 MHz CGS410 Implementation 311 APPLlCATlONS Many applications exist which can use the synthesized clock capability of the CGS410 Because of the CMOS na- ture of the device it can maintain high frequency clock rates while consuming little current This allows use of the CGS410 in battery powered systems Application requirements for the CGS410 are largely dictat- ed by the user Figure 3-13 illustrates a low cost implemen- tation Pulling the PCLK outputs to BVDD will turn the out- puts off In this configuration DIFF VOH and DIFF VOL are also tied to BVDD CMOS PCLK serves as the fre- quency output source Note also that all LCLK EXTCLK FILTER and crystal functions can be modified to address the needs of the application Figure 3-14 shows the common clock drive requirements for a video-based system The CGS410 provides all clocking sources LCLK provides a synchronized low-frequency sub- multiple of PCLK for driving the RAMDAC load data require- ments In addition LCLK can easily be used to drive the respective frame buffer array which clocks the display data The Load Clock Enable (LCLK EN) can be used to disable load clock pulses during screen blanking intervals 12 |
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