ICS844051CGIT datasheet(7/11 Pages) ICST

Part #	ICS844051CGIT

Description	FEMTOCLOCKS??CRYSTAL-TO- LVDS CLOCK GENERATOR

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Manufacturer	ICST [Integrated Circuit Systems]

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844051CGI

www.icst.com/products/hiperclocks.html

REV. A NOVEMBER 23, 2005

7

Integrated

Circuit

Systems, Inc.

ICS844051I

FEMTOCLOCKS™ CRYSTAL-TO- LVDS

CLOCK GENERATOR

PRELIMINARY

APPLICATION INFORMATION

Figure 2. CRYSTAL INPUt INTERFACE

CRYSTAL INPUT INTERFACE

The ICS844051I has been characterized with 18pF parallel

resonant crystals. The capacitor values, C1 and C2, shown in

Figure 2 below were determined using a 25MHz, 18pF parallel

resonant crystal and were chosen to minimize the ppm error.

The optimum C1 and C2 values can be slightly adjusted for dif-

ferent board layouts.

POWER SUPPLY FILTERING TECHNIQUES

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

are vulnerable to random noise. The ICS844051I provides

separate power supplies to isolate any high switching

noise from the outputs to the internal PLL. V

DD and VDDA 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

DDA pin. The 10Ω

resistor can also be replaced by a ferrite bead.

FIGURE 1. POWER SUPPLY FILTERING

10

Ω

V

DDA

10

μF

.01

μF

3.3V or 2.5V

.01

μF

V

DD

C1

X1

Crystal

C2

XTAL_IN

XTAL_OUT

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