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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MAC7100CVF датащи(PDF) 16 Page - Motorola, Inc |
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MAC7100CVF датащи(HTML) 16 Page - Motorola, Inc |
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16 / 48 page  16 MAC7100 Microcontroller Family Hardware Specifications MOTOROLA PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE Electrical Characteristics 3.8.2.1 Jitter Information The basic functionality of the PLL is shown in Figure 3. With each transition of the clock fcmp, the deviation from the reference clock fref is measured and input voltage to the VCO is adjusted accordingly. The adjustment is done continuously with no abrupt changes in the clock output frequency. Noise, voltage, temperature and other factors cause slight variations in the control loop resulting in a clock jitter. This jitter affects the real minimum and maximum clock periods as illustrated in Figure 4. It is important to note that the pre-scaler used by timers and serial modules will eliminate the effect of PLL jitter to a large extent. Figure 4. Jitter Definitions The relative deviation of tNOM is at its maximum for one clock period, and decreases towards zero for larger number of clock periods (N). Thus, jitter is defined as: For N < 100, the following equation is a good fit for the maximum jitter: Figure 5. Maximum Bus Clock Jitter Approximation 0 tMIN1 12 3 N–1 N tNOM tMAX1 tMIN(N) tMAX(N) JN () max 1 tMAX N () NtNOM ⋅ --------------------- –1 tMIN N () NtNOM ⋅ --------------------- – , = JN () j1 N -------- j2 + = 01 5 10 20 15 N J(N) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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