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ICS840004-01 Datasheet(PDF) 9 Page - Integrated Circuit Systems

Part # ICS840004-01
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

ICS840004-01 Datasheet(HTML) 9 Page - Integrated Circuit Systems

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Integrated
Circuit
Systems, Inc.
840004AG-01
www.icst.com/products/hiperclocks.html
REV. B JANUARY 3, 2006
9
ICS840004-01
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 ICS840004-01 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 ICS840004-01 has been characterized with 18pF
parallel resonant crystals. The capacitor values shown
in Figure 2 below were determined using a 25MHz 18pF
Figure 2. CRYSTAL INPUt INTERFACE
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
ICS840004-01


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