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ICS843242AGT Datasheet(PDF) 8 Page - Integrated Device Technology |
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ICS843242AGT Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 16 page IDT™ / ICS™ 3.3V LVPECL FREQUENCY SYNTHESIZER 8 ICS843242AG REV. A OCTOBER 2, 2007 ICS843242 FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER PRELIMINARY APPLICATION INFORMATION CRYSTAL INPUT INTERFACE The ICS843242 has been characterized with 18pF parallel resonant crystals. The capacitor values shown in Figure 2 below were determined using a 31.25MHz or 26.041666MHz FIGURE 2. CRYSTAL INPUt INTERFACE 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 ICS843242 provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. V CC, VCCA, VCCO_A and V CCO_B 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 0.01μF bypass capacitor should be connected to each V CCA pin. FIGURE 1. POWER SUPPLY FILTERING 10 Ω V CCA 10 μF .01 μF 3.3V .01 μF V CC C1 33p X1 18pF Parallel Crystal C2 27p XTAL_OUT XTAL_IN |
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