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ICS843256AM Datasheet(PDF) 8 Page - Integrated Circuit Systems

No. de pieza ICS843256AM
Descripción Electrónicos  FEMTOCLOCKS??CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
PDF  13 Pages
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Fabricante Electrónico  ICST [Integrated Circuit Systems]
Página de inicio  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS843256AM Datasheet(HTML) 8 Page - Integrated Circuit Systems

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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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