840AM125 datasheet(6/9 Pages) ICST

Part #	840AM125

Description	125MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT

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Manufacturer	ICST [Integrated Circuit Systems]

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6 / 9 page

840AG-125

www.icst.com/products/hiperclocks.html

REV. A FEBRUARY 3, 2006

6

Integrated

Circuit

Systems, Inc.

ICS840-125

125MHZ, LVCMOS/LVTTL

OSCILLATOR REPLACEMENT

APPLICATION INFORMATION

Figure 1. CRYSTAL INPUt INTERFACE

CRYSTAL INPUT INTERFACE

The ICS840-125 has been characterized with 18pF parallel

resonant crystals. The capacitor values, C1 and C2, shown in

Figure 1 below were determined using a 25MHz, 18pF paral-

lel resonant crystal and were chosen to minimize the ppm

error. The optimum C1 and C2 values can be slightly adjusted

for different board layouts.

X1

18pF Parallel Cry stal

C1

12p

XTAL_OUT

XTAL_IN

C2

12p

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