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ICS0004AI01L датащи(PDF) 10 Page - Integrated Device Technology

номер детали ICS0004AI01L
подробное описание детали  FEMTOCLOCKS??CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
PDF  16 Pages
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производитель  IDT [Integrated Device Technology]
домашняя страница  http://www.idt.com
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ICS0004AI01L датащи(HTML) 10 Page - Integrated Device Technology

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840004AGI-01
10
REV. A OCTOBER 22, 2007
ICS840004I-01
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
APPLICATION INFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS840004I-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 ICS840004I-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 25MHz, 18pF parallel reso-
nant crystal and were chosen to minimize the ppm error.
ICS84332
XTAL_IN
XTAL_OUT
X1
18pF Parallel Cry stal
C2
22p
C1
22p
ICS840004I-01



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