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ICS650-41 датащи(PDF) 4 Page - Integrated Circuit Systems |
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ICS650-41 датащи(HTML) 4 Page - Integrated Circuit Systems |
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4 / 11 page ![]() Spread Spectrum Clock Synthesizer MDS 650-41 F 4 Revision 082305 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com ICS650-41 PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) The 0.01µF decoupling capacitors should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between the decoupling capacitors and VDD pins. The PCB trace to VDD pins should be kept as short as possible, as should the PCB trace to the ground via. 2) The external crystal should be mounted just next to the device with short traces. The X1 and X2 traces should not be routed next to each other with minimum spaces, instead they should be separated and away from other traces. 3) To minimize EMI, the 33 Ω series termination resistor (if needed) should be placed close to the clock output. 4) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Other signal traces should be routed away from the ICS650-41. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. |
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