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ICS8432BY51L Datasheet(PDF) 9 Page - Integrated Circuit Systems

Part # ICS8432BY51L
Description  700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS8432BY51L Datasheet(HTML) 9 Page - Integrated Circuit Systems

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8432BY-51
www.icst.com/products/hiperclocks.html
REV. C APRIL 8, 2005
9
Integrated
Circuit
Systems, Inc.
ICS8432-51
700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
Figure 3. CRYSTAL INPUt INTERFACE
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 termina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
FOUTx and nFOUTx are low impedance follower outputs that
generate ECL/LVPECL compatible outputs.Therefore, terminat-
ing resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
FIGURE 4B. LVPECL OUTPUT TERMINATION
FIGURE 4A. LVPECL OUTPUT TERMINATION
drive 50
Ω transmission lines. Matched impedance 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
circuit and clock component process variations.
TERMINATION FOR LVPECL OUTPUTS
CRYSTAL INPUT INTERFACE
The ICS8432-51 has been characterized with 18pF parallel reso-
nant crystals. The capacitor values, C1 and C2, shown in
Fig-
ure 3 below were determined using a 25MHz, 18pF parallel reso-
nant 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


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