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ICS843003AI01 Datasheet(PDF) 10 Page - Integrated Circuit Systems

Part # ICS843003AI01
Description  FEMTOCLOCKS-TM CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS843003AI01 Datasheet(HTML) 10 Page - Integrated Circuit Systems

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843003AGI-01
www.icst.com/products/hiperclocks.html
REV. A MAY 26, 2005
10
Integrated
Circuit
Systems, Inc.
ICS843003I-01
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
PRELIMINARY
TERMINATION FOR 3.3V LVPECL OUTPUT
V
CC - 2V
50
Ω
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
The clock layout topology shown below is a typical termi-
nation for LVPECL outputs. The two different layouts men-
tioned are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, ter-
minating resistors (DC current path to ground) or current
sources must be used for functionality. These outputs are
FIGURE 4B. LVPECL OUTPUT TERMINATION
FIGURE 4A. LVPECL OUTPUT TERMINATION
designed to drive 50
Ω transmission lines. Matched imped-
ance techniques should be used to maximize operating
frequency and minimize signal distortion.
Figures 4A and
4B show two different layouts which are recommended
only as guidelines. Other suitable clock layouts may exist
and it would be recommended that the board designers
simulate to guarantee compatibility across all printed cir-
cuit and clock component process variations.


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