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PL565-68DC Datasheet(PDF) 6 Page - Micrel Semiconductor |
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PL565-68DC Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 12 page (Preliminary) Analog Frequency Multiplier PL565-68 VCXO Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 9 44-0800 • fax +1(408) 474-1000 • www.micrel.com Rev 12/08/11 Page 6 AFM QFN PACKAGE APPLICAT ION CIRCUIT RECOMMENDED PCB LAYOUT Avoid ground planes underneath the crystal and inductor traces to limit parasitic capacitance. Add bypass capacitor close to VDDBUF pin. Avoid bypass capacitors near VDDOSC pins to lower cross-talk of unwanted frequencies. L1X(a,b) can be used to increase the VCXO pulling range. Using a ferrite core inductor limits the oscillation amplitude which can have a positive effect on phase noise. L2X tunes the frequency multiplier tank circuit. L2X needs to be a wire wound inductor with high Q-factor, preferably >20. The large center pad is the “thermal relief” pad and can be connected to ground. |
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