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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST2100 датащи(PDF) 31 Page - STMicroelectronics |
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ST2100 датащи(HTML) 31 Page - STMicroelectronics |
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31 / 39 page  DocID025777 Rev 1 31/39 ST2100 Clocking parameters 39 6 Clocking parameters This section details clock related electrical specifications. 6.1 Master clock (MCLK) The external circuit for generating the clock from a crystal oscillator is shown in Figure 4. Figure 4. MCLK crystal connections 1. CL1 and CL2 are the load capacitors. The value of the capacitors depends on the type of the selected crystal. To calculate the value of the load capacitance, use Equation 1. For this example, an Aker C2E-24.000-12-3030-X 24 MHz oscillator has been used. Load capacitance CL: Equation 1 CL = (CL1 × CL2 / CL1 + CL2) + CS Where CL1 and CL2 are the load capacitors and CS is the circuit's stray capacitance. In our application this implies: Equation 2 CL1 = CL2 = Cext Equation 3 Cext = (CL - CS) × 2 Example For the Aker® C2E-24.000-12-3030-X crystal: CL = 12 PF; with CS = 3 PF, Cext = CL1 = CL2 = 18 PF. Note: The ESR of the used quartz must be < 50 . |
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