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ICS844002 Datasheet(PDF) 8 Page - Integrated Device Technology |
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ICS844002 Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 16 page IDT™ / ICS™ LVDS FREQUENCY SYNTHESIZER 8 ICS844002AG REV. A SEPTEMBER 28, 2007 ICS844002 FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER APPLICATION INFORMATION CRYSTAL INPUT INTERFACE The ICS844002 has been characterized with 18pF parallel resonant crystals. The capacitor values shown in Figure 2 below Figure 2. CRYSTAL INPUt INTERFACE were determined using a 26.5625MHz, 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 ICS844002 provides sepa- rate 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 0.01 μF bypass capacitor should be connected to each V DDA pin. FIGURE 1. POWER SUPPLY FILTERING 10 Ω V DDA 10 μF .01 μF 3.3V or 2.5V .01 μF V DD C1 33p X1 18pF Parallel Crystal C2 27p XTAL_OUT XTAL_IN |
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