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ICS844004AI01 датащи(PDF) 8 Page - Integrated Circuit Systems

номер детали ICS844004AI01
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

ICS844004AI01 датащи(HTML) 8 Page - Integrated Circuit Systems

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844004AGI-01
www.icst.com/products/hiperclocks.html
REV. A JUNE 15, 2005
8
Integrated
Circuit
Systems, Inc.
ICS844004I-01
FEMTOCLOCKS™CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
PRELIMINARY
CRYSTAL INPUT INTERFACE
The ICS844004I-01 has been characterized with 18pF paral-
lel resonant crystals. The capacitor values shown in
Figure 2
Figure 2. CRYSTAL INPUt INTERFACE
below were determined using a 26.5625MHz 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
ICS844004I-01
C1
33p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS844004I-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



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