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ICS8430-51 Datasheet(PDF) 9 Page - Integrated Circuit Systems |
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ICS8430-51 Datasheet(HTML) 9 Page - Integrated Circuit Systems |
9 / 16 page 8430AY-51 www.icst.com/products/hiperclocks.html REV. D FEBRUARY 11, 2003 9 PRELIMINARY Integrated Circuit Systems, Inc. ICS8430-51 600MHZ, LOW JITTER LVCMOS/ LVTTL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER The ICS8430-51 features an internal oscillator that uses an external quartz crystal as the source of its reference frequency. A 16MHz crystal divided by 16 before being sent to the phase detector provides the reference frequency. The oscillator is a series resonant, multi-vibrator type design. This design provides better stability and eliminates the need for large on chip capacitors. Though a series resonant crystal is preferred, a parallel resonant crystal can be used. A parallel resonant mode crystal used in a series resonant circuit will exhibit a frequency of oscillation a few hundred ppm lower than specified. A few hundred ppm translates to KHz inaccuracy. In general computing applications this level of inaccuracy is irrelevant. If better ppm accuracy is required, an external capacitor can be added to a parallel resonant crystal in series to pin 24. Figure 4A shows how to interface with a crystal. Figures 4A, 4B, and 4C show various crystal parameters which are recommended only as guidelines. Figure 4A shows how to interface a capacitor with a parallel resonant crystal. Figure 3B shows the capacitor value needed for the optimum FIGURE 4B. Recommended tuning capacitance for various parallel resonant crystals. FIGURE 4C. Recommended tuning capacitance for various parallel resonant crystals. 14.318 15.000 16.667 24.000 19.440 20.000 0 10 20 30 40 50 60 14 15 16 17 18 19 20 21 22 23 24 25 Crystal Frequency (MHz) -100 -80 -60 -40 -20 0 20 40 60 80 100 0 1020 30 4050 60 Series Capacitor, C1 (pF) 19.44MHz 16MHz 15.00MHz CRYSTAL INPUT AND OSCILLATOR INTERFACE APPLICATION INFORMATION As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS8430-51 provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. V CC, VCCA, and VCCO 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 3 illustrates how a 10 Ω resistor along with a 10µF and a .01µF bypass capacitor should be connected to each V CCA pin. POWER SUPPLY FILTERING TECHNIQUES FIGURE 3. POWER SUPPLY FILTERING 10 Ω V CCA 10 µF .01 µF 3.3V .01 µF V CC FIGURE 4A. CRYSTAL INTERFACE Optional XTAL2 (Pin 25, LQFP) XTAL1 (Pin 24, LQFP) ICS8430-51 ppm performance over various parallel resonant crystals. Figure 4C shows the recommended tuning capacitance for various parallel resonant crystals. |
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