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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SW52212 датащи(PDF) 20 Page - Silicon Laboratories |
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SW52212 датащи(HTML) 20 Page - Silicon Laboratories |
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20 / 71 page  5. Functional Description 5.1 Crystal Recommendations The clock device requires a parallel resonance crystal. Table 5.1. Crystal Recommendations Frequency (Fund) Cut Loading Load Cap Shunt Cap (max) Motional (max) Tolerance (max) Stability (max) Aging (max) 25 MHz AT Parallel 8–15 pF 5 pF 0.016 pF 35 ppm 30 ppm 5 ppm 5.2 Crystal Loading Crystal loading is critical in achieving low ppm performance. To realize low ppm performance, use the total capacitance the crystal sees to calculate the appropriate capacitive loading (CL). The figure below shows a typical crystal configuration using the two trim capacitors. It is important that the trim capacitors are in series with the crystal. Figure 5.1. Crystal Capacitive Clarification Data Sheet Functional Description silabs.com | Building a more connected world. Rev. 1.0 | 20 |
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