ICS84329B datasheet(12/19 Pages) ICST

No. de pieza	ICS84329B

Descripción Electrónicos	700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

PDF	19 Pages

Scroll/Zoom	100%

Fabricante Electrónico	ICST [Integrated Circuit Systems]

Página de inicio	http://www.icst.com

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12 / 19 page

84329BV

www.icst.com/products/hiperclocks.html

REV. B JANUARY 18, 2006

Integrated

Circuit

Systems, Inc.

ICS84329B

700MHZ, LOW JITTER, CRYSTAL-TO-3.3V

DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

CC - 2V

RTT

o = 50Ω

FOUT

FIN

RTT =

((V

OH + VOL) / (VCC – 2)) – 2

3.3V

125

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.

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 6B. LVPECL OUTPUT TERMINATION

FIGURE 6A. LVPECL OUTPUT TERMINATION

designed to drive 50

Ω transmission lines. Matched imped-

ance techniques should be used to maximize operating

frequency and minmize signal distortion. Figures 6A and

6B 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

ICS84329B Datasheet(PDF) 12 Page - Integrated Circuit Systems

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