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ICS44004AI04L датащи(PDF) 7 Page - Integrated Circuit Systems

номер детали ICS44004AI04L
подробное описание детали  FEMTOCLOCKS??CRYSTAL/LVCMOS-TO-LVDS FREQUENCY SYNTHESIZER
PDF  13 Pages
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производитель  ICST [Integrated Circuit Systems]
домашняя страница  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS44004AI04L датащи(HTML) 7 Page - Integrated Circuit Systems

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844004AGI-04
www.icst.com/products/hiperclocks.html
REV. A JANUARY 26, 2006
7
Integrated
Circuit
Systems, Inc.
ICS844004I-04
FEMTOCLOCKS™CRYSTAL/LVCMOS-TO-
LVDS FREQUENCY SYNTHESIZER
PRELIMINARY
CRYSTAL INPUT INTERFACE
The ICS844004I-04 has been characterized with 18pF
parallel resonant crystals. The capacitor values shown in
Figure 2 below were determined using a 19.44MHz 18pF
parallel resonant crystal and were chosen to minimize
the ppm error.
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS844004I-04 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
.01
μF
V
DD
ICS84332
XTAL_IN
XTAL_OUT
X1
18pF Parallel Cry stal
C2
22p
C1
22p
Figure 2. CRYSTAL INPUt INTERFACE
ICS844004I-04



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