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023AI Folha de dados(PDF) 8 Page - Integrated Circuit Systems

Nome de Peças 023AI
Descrição Electrónicos  FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
PDF  13 Pages
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Fabricante Electrônico  ICST [Integrated Circuit Systems]
Página de início  http://www.icst.com
Logo ICST - Integrated Circuit Systems

023AI Folha de dados(HTML) 8 Page - Integrated Circuit Systems

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843023AGI
www.icst.com/products/hiperclocks.html
REV. A JUNE 29, 2005
8
Integrated
Circuit
Systems, Inc.
ICS843023I
FEMTOCLOCKS™CRYSTAL-TO-3.3V, 2.5V
LVPECL CLOCK GENERATOR
TERMINATION FOR 2.5V LVPECL OUTPUT
Figure 3A and Figure 3B 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 3B can be eliminated and the
termination is shown in
Figure 3C.
FIGURE 3C. 2.5V LVPECL TERMINATION EXAMPLE
FIGURE 3B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
FIGURE 3A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
R2
62.5
Zo = 50 Ohm
R1
250
+
-
2.5V
2,5V LVPECL
Driv er
R4
62.5
R3
250
Zo = 50 Ohm
2.5V
VCC=2.5V
R1
50
R3
18
Zo = 50 Ohm
Zo = 50 Ohm
+
-
2,5V LVPECL
Driv er
VCC=2.5V
2.5V
R2
50
2,5V LVPECL
Driv er
VCC=2.5V
R1
50
R2
50
2.5V
Zo = 50 Ohm
Zo = 50 Ohm
+
-



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