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ICS8535AG-11 Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS8535AG-11 Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 14 page 8535AG-11 www.icst.com/products/hiperclocks.html REV. B JULY 27, 2001 8 Integrated Circuit Systems, Inc. ICS8535-11 LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ LVCMOS-TO-3.3V LVPECL FANOUT BUFFER APPLICATION INFORMATION CRYSTAL OSCILLATOR CIRCUIT FREQUENCY FINE TUNING A crystal can be characterized for either series or parallel mode operation. The ICS8535-11 and ICS8533-11 fanout buffers have built-in crystal oscillator circuits that can accept either a series or parallel crystal without additional components. The frequency accuracy provided by this configuration is sufficient for most computer applications. For applications requiring highly accurate clock frequencies, the output frequency can be fine tuned by inserting a small series capacitor C1 at the XTAL1 input (Pin 6 for ICS8535-11) as shown in Figure 7. This fine tuning approach can be applied in either parallel or series crystal. The C1 value depends on the crystal type, frequency and the board layout. The parallel crystal fine tuning results in smaller ppm and better performance. It is difficult to provide the precise value of C1. This section provides recommended series capacitor C1 values to start with. This example uses 18pF parallel crystals. Figure 7 shows the suggested series capacitor value for a parallel crystal. For a 16.666 MHz crystal, the recommended C1 value is about 33pF. Figure 8 shows frequency accuracy versus series capacitance for 19.44MHz, 16.666MHz and 15MHz crystals. As seen from this figure, a 24pF, 33pF and 43pF series capacitor is used to achieve the lowest ppm error for 19.44MHz, 16.666MHz and 15MHz respectively. Figure 9 shows the experiment results of crystal oscillator frequency drift due to temperature variation. X1 U1 XTAL2 XTAL1 C1 FIGURE 7 - CRYSTAL INTERFACE WITH SERIES CAPACITOR C1. |
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