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ICS840004AGI Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS840004AGI Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 11 page Integrated Circuit Systems, Inc. 840004AGI www.icst.com/products/hiperclocks.html REV. A JUNE 28, 2005 8 ICS840004I FEMTOCLOCKS™CRYSTAL-TO- LVCMOS/LVTTL FREQUENCY SYNTHESIZER PRELIMINARY APPLICATION INFORMATION As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS840004I 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 ICS840004I has been characterized with 18pF parallel reso- nant crystals.The capacitor values shown in Figure 2 below were Figure 2. CRYSTAL INPUt INTERFACE determined using a 26.5625MHz 18pF parallel resonant crystal and were chosen to minimize the ppm error. ICS84332 XTAL_IN XTAL_OUT X1 18pF Parallel Cry stal C2 22p C1 22p |
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