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ICS843252AGLFT Datasheet(PDF) 9 Page - Integrated Circuit Systems

Part # ICS843252AGLFT
Description  FEMTOCLOCKS??CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS843252AGLFT Datasheet(HTML) 9 Page - Integrated Circuit Systems

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843252AG
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 9, 2005
9
Integrated
Circuit
Systems, Inc.
ICS843252
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
PRELIMINARY
APPLICATION INFORMATION
CRYSTAL INPUT INTERFACE
The ICS843252 has been characterized with 18pF parallel reso-
nant crystals. The capacitor values shown in Figure 2 below
Figure 2. CRYSTAL INPUt INTERFACE
were determined using a 19.53125 or 25MHz, 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS843252 provides sepa-
rate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC, VCCA, and VCCO_X
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 pin.
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
CCA
10
μF
.01
μF
3.3V
.01
μF
V
CC
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN


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