ICS84329 datasheet(10/19 Pages) ICST

Part #	ICS84329

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

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Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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10 / 19 page

84329AV

www.icst.com/products/hiperclocks.html

REV. D DECEMBER 15, 2004

10

Integrated

Circuit

Systems, Inc.

ICS84329

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

DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

The ICS84329 features an internal oscillator that uses an external

quartz crystal as the source of its reference frequency. The

oscillator is a series resonant, multi-vibrator type design. This

design provides better stability and eliminates the need for large

on chip capacitors.Though a series resonant crystal is preferred,

a parallel resonant crystal can be used. A parallel resonant mode

crystal used in a series resonant circuit will exhibit a frequency

of oscillation a few hundred ppm lower than specified. A few

hundred ppm translates to KHz inaccuracy. In general computing

applications, this level of inaccuracy is irrelevant. If better ppm

accuracy is required, an external capacitor can be added to a

quartz crystal in series to XTAL_IN.

Figure 5A shows how to

interface with a crystal.

Figures 5A and 5B show various crystal parameters which are

recommended only as guidelines.

Figure 5A shows how to inter-

face a capacitor with a parallel resonant crystal.

Figure 5B shows

the capacitor value needed for the optimum ppm performance

over various series resonant crystal frequencies. For IA64/32

platforms which required a Raltron Parallel Resonant Quartz

crystal part #AS-16.66-18-SMD-T-M1, a 7pF series capacitor can

be used to better the ppm accuracy.

FIGURE 5A. CRYSTAL INTERFACE

NOTE: For crystal frequencies higher than 17MHz,

a series tuning capacitor is required for proper operation.

XTAL_OUT

XTAL_IN

ICS84329

FIGURE 5B. Recommended tuning capacitance for various series

resonant crystals.

CRYSTAL INPUT AND OSCILLATOR INTERFACE

10.000

14.318

12.000

24.000

20.000

16.000

0

5

10

15

20

25

30

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

Series Resonant Crystal Frequency (MHz)

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