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S1D2502B01 Datasheet(PDF) 50 Page - Samsung semiconductor |
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S1D2502B01 Datasheet(HTML) 50 Page - Samsung semiconductor |
50 / 61 page VIDEO AMP MERGED OSD PROCESSOR FOR MONITORS S1D2502B01 49 Preliminary TUNNING FACTORS OF THE S1D2502B01 PLL • PLL External Circuit You may follow the recommendations for PCB art work and input/output signal characteristic improvement in recommendation. The external circuit that has the most influence on S1D2502B01 PLL block operation is pin 3 (VCO_IN) and pin 4 (CP_OUT)'s surrounding circuit. Refer to OSD PLL block. Because the PLL circuit is basically a feedback circuit, there are many components that influence the characteristics. C1, R1, R2, and R3 do not have a localized effect. As you can see, they are connected to the PLL control bits and influence the characteristics through their complicated relationships. The main functions of the time canstant and their reference values are as follows. Figure 24. PLL External Circuit Table 14. Main Function of Time Constant in PLL External Circuit Time Canstant Recommended Value Main Function C1 562 (or 103, 223) Influences the damping ratio and controls the PLL response time R1 5.6K Ω(7.5KΩ) Same as C1 R2 27K Ω (or 33KΩ) Charge pump current adjustment R3 (Option) 30M Ω (or 20MΩ) Extend frequency range 3 4 R1 R2 C1 R3 (option) |
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