ICS840011 datasheet(7/11 Pages) ICST

7 / 11 page

840011AG

www.icst.com/products/hiperclocks.html

REV. A OCTOBER 15, 2004

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

Zo = 50 Ohm

0.1u

VDD

ICS840011

VDDA

XTAL_OUT

XTAL_IN

VDD

GND

0.1u

10uF

27pF

33pF

VDD=3.3V

VDDA

VDD

LVCMOS

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