ICS3002AI01L datasheet(7/15 Pages) ICST

7 / 15 page

843002AGI-01

www.icst.com/products/hiperclocks.html

REV. A JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843002I-01

FEMTOCLOCKS™CRYSTAL-TO-

3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER

APPLICATION INFORMATION

As in any high speed analog circuitry, the power supply pins

are vulnerable to random noise. The ICS843002I-01 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 1 illustrates how

a 10

Ω resistor along with a 10µF and a .01μF bypass

capacitor should be connected to each V

CCA.

POWER SUPPLY FILTERING TECHNIQUES

FIGURE 1. POWER SUPPLY FILTERING

CCA

μF

.01

μF

3.3V or 2.5V

.01

μF

CRYSTAL INPUT INTERFACE

The ICS843002I-01 has been characterized with 18pF

parallel resonant crystals. The capacitor values shown in

Figure 2 below were determined using a 25MHz 18pF

Figure 2. CRYSTAL INPUt INTERFACE

parallel resonant crystal and were chosen to minimize the

ppm error.

ICS843002I-01

33p

18pF Parallel Crystal

27p

XTAL_OUT

XTAL_IN

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