ICS843004AI04 datasheet(6/14 Pages) ICST

6 / 14 page

843004AGI-04

www.icst.com/products/hiperclocks.html

REV. A FEBRUARY 15, 2006

Integrated

Circuit

Systems, Inc.

ICS843004I-04

FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO-

3.3V LVPECL FREQUENCY SYNTHESIZER

CRYSTAL INPUT INTERFACE

The ICS843004I-04 has been characterized with 18pF

parallel resonant crystals. The capacitor values shown in

Figure 2 below were determined using a 19.44MHz,

18pF parallel resonant crystal and were chosen to mini-

mize the ppm error.

APPLICATION INFORMATION

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

are vulnerable to random noise. The ICS843004I-04 pro-

vides separate power supplies to isolate any high switch-

ing noise from the outputs to the internal PLL. V

CC, VCCA, and

DDO 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

.01

μF

Figure 2. CRYSTAL INPUt INTERFACE

22p

18pF Parallel Crystal

22p

XTAL_OUT

XTAL_IN

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