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ICS840011AG Datasheet(PDF) 7 Page - Integrated Circuit Systems

Part # ICS840011AG
Description  FEMTOCLOCKS CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS840011AG Datasheet(HTML) 7 Page - Integrated Circuit Systems

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840011AG
www.icst.com/products/hiperclocks.html
REV. A OCTOBER 15, 2004
7
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
APPLICATION SCHEMATIC
Figure 3A shows a schematic example of the ICS840011. An
example of LVCMOS termination is shown in this schematic.
Additional LVCMOS termination approaches are shown in the
LVCMOS Termination Application Note. In this example, an 18pF
parallel resonant 26.5625MHz crystal is used for generating
106.25MHz output frequency. The C1 = 27pF and C2 = 33pF
are recommended for frequency accuracy. For different board
layout, the C1 and C2 values may be slightly adjusted for opti-
mizing frequency accuracy.
FIGURE 3A. ICS840011 SCHEMATIC EXAMPLE
PC BOARD LAYOUT EXAMPLE
Figure 3B shows an example of P.C. board layout. The crystal
X1 footprint in this example allows either surface mount (HC49S)
or through hole (HC49) package. C3 is 0805. C1 and C2 are
0402. Other resistors and capacitors are 0603. This layout as-
sumes that the board has clean analog power and ground planes.
FIGURE 3B. ICS840011 PC BOARD LAYOUT EXAMPLE
R3
43
Zo = 50 Ohm
R2
10
OE
C5
0.1u
VDD
U1
ICS840011
1
2
3
4
8
7
6
5
VDDA
OE
XTAL_OUT
XTAL_IN
VDD
Q0
GND
NC
C4
0.1u
C3
10uF
C1
27pF
C2
33pF
VDD=3.3V
X1
VDDA
VDD
Q
LVCMOS


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