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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA33013TR датащи(PDF) 20 Page - STMicroelectronics |
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STA33013TR датащи(HTML) 20 Page - STMicroelectronics |
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20 / 55 page  PLL STA330 20/55 In the following examples floor means rounded towards zero and round means rounded to nearest integer. Example 1 FXTI = 13 MHz fS = 44.1 kHz IDF should be equal to 3 otherwise LDF become less than 8 (FRAC_CTRL must be 1): LDF = floor(45.1584 / (13 / IDF)) = 10 FRACT = round([(45.1584 / (13 / IDF)) - floor(45.1584 / (13 / IDF))] * 216) = 27602 Using the above configuration, the system clock is 45.15841675 MHz, the approximate static error is 16 Hz (that is, 0.5 ppm). Example 2 FXTI = 19.2 MHz fS = 48 kHz IDF should be equal to 4 otherwise LDF become less than 8 (FRAC_CTRL must be 1): LDF = floor(49.152 / (19.2 / IDF)) = 10 FRACT = round([(49.152 / (19.2 / IDF)) - floor(49.152 / (19.2 / IDF))] * 216) = 15728 Using the above configuration, the system clock is 49.151953125 MHz, the approximate static error is 47 Hz (that is, 1 ppm). |
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