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ICS844003AI01 датащи(PDF) 9 Page - Integrated Circuit Systems

номер детали ICS844003AI01
подробное описание детали  FEMTOCLOCKS??CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
PDF  12 Pages
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производитель  ICST [Integrated Circuit Systems]
домашняя страница  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS844003AI01 датащи(HTML) 9 Page - Integrated Circuit Systems

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844003AGI-01
www.icst.com/products/hiperclocks.html
REV. A MAY 31, 2005
9
Integrated
Circuit
Systems, Inc.
ICS844003I-01
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER
PRELIMINARY
APPLICATION INFORMATION
CRYSTAL INPUT INTERFACE
The ICS844003I-01 has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in
Figure 3 below
Figure 3. CRYSTAL INPUt INTERFACE
were determined using a 19.53125MHz or 25MHz 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
ICS844003I-01
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS844003I-01 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
DD, VDDA, and VDDOx
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 2 illustrates how
a 10
Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each V
DDA pin.
FIGURE 2. POWER SUPPLY FILTERING
10
Ω
V
DDA
10
μF
.01
μF
3.3V
.01
μF
V
DD
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN



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