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ICS844246 bảng dữ liệu(PDF) 9 Page - Integrated Circuit Systems

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Giải thích chi tiết về linh kiện  FEMTOCLOCKS??CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
PDF  13 Pages
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nhà sản xuất  ICST [Integrated Circuit Systems]
Trang chủ  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS844246 bảng dữ liệu(HTML) 9 Page - Integrated Circuit Systems

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844246AM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 29, 2005
8
Integrated
Circuit
Systems, Inc.
ICS844246
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
PRELIMINARY
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS844246 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
DD, VDDA and
V
DDO 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 10
μF and a .01μF bypass capacitor
should be connected to each V
DDA pin. The 10Ω resistor
can also be replaced by a ferrite bead.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
DDA
10
μF
.01
μF
3.3V
.01
μF
V
DD
APPLICATION INFORMATION
CRYSTAL INPUT INTERFACE
The ICS844246 has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 2
Figure 2. CRYSTAL INPUt INTERFACE
below were determined using an 18pF parallel resonant
crystal and were chosen to minimize the ppm error.
C1
22p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN



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