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ICS844256AM 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
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nhà sản xuất  ICST [Integrated Circuit Systems]
Trang chủ  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS844256AM bảng dữ liệu(HTML) 9 Page - Integrated Circuit Systems

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844256AM
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 29, 2005
9
Integrated
Circuit
Systems, Inc.
ICS844256
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 ICS844256 pro-
vides separate power supplies to isolate any high switch-
ing 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 ICS844256 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 crys-
tal and were chosen to minimize the ppm error.
C1
18p
X1
18pF Parallel Crystal
C2
22p
XTAL_IN
XTAL_OUT



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