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ICS840004AGI Datasheet(PDF) 8 Page - Integrated Circuit Systems

Part # ICS840004AGI
Description  FEMTOCLOCKS??CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS840004AGI Datasheet(HTML) 8 Page - Integrated Circuit Systems

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Integrated
Circuit
Systems, Inc.
840004AGI
www.icst.com/products/hiperclocks.html
REV. A JUNE 28, 2005
8
ICS840004I
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
PRELIMINARY
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS840004I provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
DD, VDDA, and VDDO
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.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
DDA
10
μF
.01
μF
3.3V or 2.5V
.01
μF
V
DD
CRYSTAL INPUT INTERFACE
The ICS840004I has been characterized with 18pF parallel reso-
nant crystals.The capacitor values shown in
Figure 2 below were
Figure 2. CRYSTAL INPUt INTERFACE
determined using a 26.5625MHz 18pF parallel resonant crystal and
were chosen to minimize the ppm error.
ICS84332
XTAL_IN
XTAL_OUT
X1
18pF Parallel Cry stal
C2
22p
C1
22p


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