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ICS84314AYT Datasheet(PDF) 10 Page - Integrated Circuit Systems

Part # ICS84314AYT
Description  350MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS84314AYT Datasheet(HTML) 10 Page - Integrated Circuit Systems

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84314AY
www.icst.com/products/hiperclocks.html
REV. C JANUARY 27, 2005
10
Integrated
Circuit
Systems, Inc.
ICS84314
350MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL
FREQUENCY SYNTHESIZER W/FANOUT BUFFER
Figure 5. CRYSTAL INPUt INTERFACE
CRYSTAL INPUT INTERFACE
The ICS84314 has been characterized with 18pF parallel resonant
crystals. The capacitor values, C1 and C2, shown in
Figure 5 below
were determined using a 25MHz, 18pF parallel resonant crystal and
were chosen to minimize the ppm error. The optimum C1 and C2
values can be slightly adjusted for different board layouts.
C1
22p
X1
18pF Parallel Cry stal
C2
22p
XTAL2
XTAL1
TERMINATION FOR 2.5V LVPECL OUTPUT
Figure 4A and Figure 4B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminat-
ing 50
Ω to V
CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to
ground level. The R3 in Figure 4A can be eliminated and the
termination is shown in
Figure 4C.
FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE
R2
50
Zo = 50 Ohm
VCCO=2.5V
R1
50
Zo = 50 Ohm
+
-
2.5V
2,5V LVPECL
Driv er
FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
VCCO=2.5V
R1
50
R2
50
Zo = 50 Ohm
R3
18
2,5V LVPECL
Driv er
Zo = 50 Ohm
+
-
2.5V
FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
R2
62.5
2.5V
2,5V LVPECL
Driv er
R3
250
Zo = 50 Ohm
Zo = 50 Ohm
R4
62.5
2.5V
+
-
R1
250
VCCO=2.5V


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