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WM8753LEB/V датащи(PDF) 67 Page - Wolfson Microelectronics plc |
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WM8753LEB/V датащи(HTML) 67 Page - Wolfson Microelectronics plc |
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67 / 87 page ![]() WM8753L Advanced Information w AI Rev 3.1 June 2004 67 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 8:5 PLL1N 1000 Integer (N) part of PLL1 input/output frequency ratio. Use values greater than 5 and less than 13. R54 (36h) PLL1 Control (2) 3:0 PLL1K [21:18] 0011 R55 (37h) PLL1 Control (3) 8:0 PLL1K [17:9] 024h R56 (38h) PLL1 Control (4) 8:0 PLL1K [8:0] 1Bah Fractional (K) part of PLL1 input/output frequency ratio (treat as one 22-digit binary number). Table 63 PLL1 Frequency Ratio Control REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 8:5 PLL2N 1000 Integer (N) part of PLL2 input/output frequency ratio. Use values greater than 5 and less than 13. R58 (3Ah) PLL2 Control (2) 3:0 PLL2K [21:18] 0011 R59 (3Bh) PLL2 Control (2) 8:0 PLL2K [17:9] 024h R60 (3Ch) PLL2 Control (3) 8:0 PLL2K [8:0] 1Bah Fractional (K) part of PLL2 input/output frequency ratio (treat as one 22-digit binary number) Table 64 PLL2 Frequency Ratio Control The PLL performs best when f2 is around 90MHz. Its stability peaks at N=8. Some example settings are shown below. MCLK (MHz) (F1) DESIRED OUTPUT (MHz) F2 (MHz) MCLK DIV2 PLL OUT DIV2 CLK OUT DIV2 R N (Hex) K (Hex) 11.91 11.2896 90.3168 0 1 0 7.5833 7 25545F 11.91 12.288 98.304 0 1 0 8.2539 8 103FF8 12 11.2896 90.3168 0 1 0 7.5264 7 21B08A 12 12.288 98.304 0 1 0 8.192 8 C49BA 13 11.2896 90.3168 0 1 0 6.9474 6 3CA2F5 13 12.288 98.304 0 1 0 7.5618 7 23F54A 14.4 11.2896 90.3168 0 1 0 6.272 6 116873 14.4 12.288 98.304 0 1 0 6.8267 6 34E81B 19.2 11.2896 90.3168 1 1 0 9.408 9 1A1CAC 19.2 12.288 98.304 1 1 0 10.24 A F5C29 19.68 11.2896 90.3168 1 1 0 9.1785 9 B6D25 19.68 12.288 98.304 1 1 0 9.9902 9 3F6028 19.8 11.2896 90.3168 1 1 0 9.1229 9 7DDBE 19.8 12.288 98.304 1 1 0 9.9297 9 3B8028 24 11.2896 90.3168 1 1 0 7.5264 7 21B08A 24 12.288 98.304 1 1 0 8.192 8 C49BA 26 11.2896 90.3168 1 1 0 6.9474 6 3CA2F5 26 12.288 98.304 1 1 0 7.5618 7 23F54A 27 11.2896 90.3168 1 1 0 6.6901 6 2C2B25 27 12.288 98.304 1 1 0 7.2818 7 1208A6 Table 65 PLL Frequency Examples |
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