ICS843256AG datasheet(8/13 Pages) ICST

Part #	ICS843256AG

Description	FEMTOCLOCKS??CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

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Manufacturer	ICST [Integrated Circuit Systems]

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8 / 13 page

843256AM

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 29, 2005

8

Integrated

Circuit

Systems, Inc.

ICS843256

FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL

FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

PRELIMINARY

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

are vulnerable to random noise.The ICS843256 provides sepa-

rate 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 iso-

lation is required. Figure 1 illustrates how a 10

Ω resistor along

with a 10

μF and a .01μF bypass capacitor should be con-

nected to each V

CCA pin. The 10Ω resistor can also be re-

placed by a ferrite bead.

POWER SUPPLY FILTERING TECHNIQUES

FIGURE 1. POWER SUPPLY FILTERING

10

Ω

V

CCA

10

μF

.01

μF

3.3V

.01

μF

V

CC

APPLICATION INFORMATION

CRYSTAL INPUT INTERFACE

The ICS843256 has been characterized with 18pF parallel

resonant crystals. The capacitor values shown in Figure 2

Figure 2. CRYSTAL INPUt INTERFACE

below were determined using an 18pF parallel resonant

crystal and were chosen to minimize the ppm error.

C1

18p

X1

18pF Parallel Crystal

C2

22p

XTAL_IN

XTAL_OUT

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