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ICS843252AGLFT Datasheet(PDF) 9 Page - Integrated Circuit Systems |
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ICS843252AGLFT Datasheet(HTML) 9 Page - Integrated Circuit Systems |
9 / 15 page 843252AG www.icst.com/products/hiperclocks.html REV. A NOVEMBER 9, 2005 9 Integrated Circuit Systems, Inc. ICS843252 FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER PRELIMINARY APPLICATION INFORMATION CRYSTAL INPUT INTERFACE The ICS843252 has been characterized with 18pF parallel reso- nant crystals. The capacitor values shown in Figure 2 below Figure 2. CRYSTAL INPUt INTERFACE were determined using a 19.53125 or 25MHz, 18pF parallel resonant crystal and were chosen to minimize the ppm error. POWER SUPPLY FILTERING TECHNIQUES As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS843252 provides sepa- rate power supplies to isolate any high switching noise from the outputs to the internal PLL. V CC, VCCA, and VCCO_X should be individually connected to the power supply plane through vias, and bypass capacitors should be used for each pin. To achieve optimum jitter performance, power supply isolation is required. Figure 1 illustrates how a 10 Ω resistor along with a 10μF and a .01μF bypass capacitor should be connected to each V CCA pin. FIGURE 1. POWER SUPPLY FILTERING 10 Ω V CCA 10 μF .01 μF 3.3V .01 μF V CC C1 22p X1 18pF Parallel Crystal C2 22p XTAL_OUT XTAL_IN |
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