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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCK2023 датащи(PDF) 21 Page - NXP Semiconductors |
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PCK2023 датащи(HTML) 21 Page - NXP Semiconductors |
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21 / 30 page  Philips Semiconductors Product data PCK2023 CK408 (66/100/133/200 MHz) spread spectrum differential system clock generator 2001 Sep 07 21 APPLICATION NOTES Optimum performance of the PCK2023 can only be achieved through correct implementation in the system board. This application note addresses many of the issues associated with integrating the PCK2023 on a system board. Descriptions for circuit board layout and decoupling are provided in this application note. Circuit board layout It is possible to generate a circuit board with the proper characteristics using four-layer configuration. Figure 11 shows the layer stack-up. It is critical to keep the clock signals on a plane next to a ground plane to ensure they are ground referenced otherwise the clock signals may experience significant distortion and added jitter. Static signals (such as SPREAD, PWRDWN, etc.) can be placed on a layer next to the power plane. The components associated with the clocks should be placed on the same layer as the PCK2023 IC. This will allow the layout to avoid the use of vias for interconnect, thereby reducing node capacitance and trace inductance. All components should be placed as close to the IC as possible. CLOCK SIGNALS GROUND POWER STATIC SIGNALS SW00857 Figure 11. Optimum board layout |
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