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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4092 датащи(PDF) 22 Page - STMicroelectronics |
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AN4092 датащи(HTML) 22 Page - STMicroelectronics |
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22 / 38 page  FMPLL and crystal oscillator AN4092 22/38 Doc ID 023080 Rev 2 2.5 Layout recommendations ● Keep the area of the oscillator circuit as compact as possible, keep tracks very short; ● Avoid any track crossing the oscillator area, also considering inner layers between the components and the ground plane; ● Keep the routing on one layer; ● Create an island for the oscillator ground on the top layer; ● Open all the inner layers in correspondence of the oscillator to reduce capacitance; ● Surround the oscillator area on component side with a GND guard, do not fill the area with ground. To be effective, the guard trace must be grounded by vias every a short lenght (< wavelenght / 20, with reference at the higher frequency present); ● Use robust SMT pads for components in crystal oscillator, short track lengths for all signals. Figure 9. PCB layout example for SPC563Mxx / SPC564Axx |
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