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PL680-39QCL-R Datasheet(PDF) 3 Page - PhaseLink Corporation |
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PL680-39QCL-R Datasheet(HTML) 3 Page - PhaseLink Corporation |
3 / 10 page (Preliminary) PL680-37/38/39 38-640MHz Low Phase Noise XO 47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 11/28/05 Page 3 FREQUENCY SELECTION TABLE SEL2 SEL1 SEL0 Selected Multiplier/Output Frequency 0 0 0 VCO Max* 0 0 1 VCO Min* 0 1 0 Reserved 0 1 1 Reserved 1 0 0 Fin x 2 1 0 1 Fin x 8 1 1 0 Fin x 16 1 1 1 Fin x 4 All SEL pads have internal pull-ups (default value is ‘1’). Bond to GND to set to 0. * Special Test Modes to help selecting the inductor value for the target output frequency. PERFORMANCE TUNING & INDUCTOR VALUE SELECTION Please refer to PhaseLink’s ‘PhasorV Tuning Assistance’ software to automatically calculate the optimum inductor values. In addition, the chart below could be used as a reference for quick inductor value selection. Use the special test modes “VCO Max” and “VCO Min” to determine the optimum inductor value. “VCO Max” represents the high end of the VCO range and “VCO Min” represents the low end of the VCO range. The output frequency in the “VCO Max” and “VCO Min” test modes is VCO/16. This means that the output frequencies are around the crystal frequency that will be used. The optimum inductor value is where the target crystal frequency is closest to the middle between the “VCO Max” and “VCO Min” output frequencies. In this case the VCO will lock in the middle of its tuning range with maximum margin on either side. |
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