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ICS84329BYLFT Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS84329BYLFT Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 19 page 84329BV www.icst.com/products/hiperclocks.html REV. B JANUARY 18, 2006 8 Integrated Circuit Systems, Inc. ICS84329B 700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER APPLICATION INFORMATION As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS84329B provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. V CC and VCCA 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 2 illustrates how a 10 Ω resistor along with a 10μF and a .01μF bypass capacitor should be connected to each V CCA pin. The 10Ω resistor can also be replaced by a ferrite bead. FIGURE 2. POWER SUPPLY FILTERING 10 Ω V CCA 10 μF .01 μF 3.3V .01 μF V CC POWER SUPPLY FILTERING TECHNIQUES CRYSTAL INPUT INTERFACE The ICS84329B has been characterized with 18pF parallel resonant crystals. The capacitor values, C1 and C2, shown in Figure 3 below were determined using a 25MHz, 18pF Figure 3. CRYSTAL INPUt INTERFACE parallel resonant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts. ICS84332 XTAL_IN XTAL_OUT X1 18pF Parallel Cry stal C2 22p C1 22p INPUTS: LVCMOS CONTROL PINS: All control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. A 1k Ω resistor can be used. RECOMMENDATIONS FOR UNUSED INPUT PINS |
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