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ICS843204I Datasheet(PDF) 6 Page - Integrated Circuit Systems |
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ICS843204I Datasheet(HTML) 6 Page - Integrated Circuit Systems |
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6 / 12 page  843204AGI www.icst.com/products/hiperclocks.html REV. A JANUARY 6, 2006 6 Integrated Circuit Systems, Inc. ICS843204I FEMTOCLOCKS™ CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER PRELIMINARY CRYSTAL INPUT INTERFACE The ICS843204I has been characterized with 18pF parallel resonant crystals. The capacitor values shown in Figure 2. CRYSTAL INPUt INTERFACE Figure 2 below were determined using an 18pF parallel resonant crystal and were chosen to minimize the ppm error. ICS843204I C1 33p X1 18pF Parallel Crystal C2 27p XTAL_OUT XTAL_IN APPLICATION INFORMATION As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS843204I provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. V CC, VCCA, and V CCO_x should be individually connected to the power sup- ply 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. POWER SUPPLY FILTERING TECHNIQUES FIGURE 1. POWER SUPPLY FILTERING 10 Ω V CCA 10 μF .01 μF 3.3V .01 μF V CC |
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