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ICS840002AGILFT Datasheet(PDF) 9 Page - Integrated Circuit Systems |
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ICS840002AGILFT Datasheet(HTML) 9 Page - Integrated Circuit Systems |
9 / 13 page Integrated Circuit Systems, Inc. 840002AGI www.icst.com/products/hiperclocks.html REV. A MARCH 10, 2005 9 ICS840002I FEMTOCLOCKS™CRYSTAL-TO- LVCMOS/LVTTL FREQUENCY SYNTHESIZER APPLICATION INFORMATION As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS840002I provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. V DD, VDDA, and VDDO 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 DDA. POWER SUPPLY FILTERING TECHNIQUES FIGURE 1. POWER SUPPLY FILTERING 10 Ω V DDA 10 μF .01 μF 3.3V or 2.5V .01 μF V DD CRYSTAL INPUT INTERFACE The ICS840002I has been characterized with 18pF parallel resonant crystals. The capacitor values shown in Figure 2 Figure 2. CRYSTAL INPUt INTERFACE below were determined using a 26.5625MHz 18pF parallel resonant crystal and were chosen to minimize the ppm error. ICS840002I C1 22p X1 18pF Parallel Crystal C2 22p XTAL_OUT XTAL_IN |
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