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参数资料
| 型号： | ICS84329AVLF |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 700 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封装： | 11.60 X 11.40 MM, 4.10 MM HEIGHT, LEAD FREE, PLASTIC, MS-018, LCC-28 |
| 文件页数： | 2/19页 |
| 文件大小： | 279K |
| 代理商： | ICS84329AVLF |
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)
Ser
ies
Capac
itor
(
pf)
相关PDF资料 |
PDF描述 |
|---|---|
| ICS84329AVT | 700 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| ICS84329AYT | 700 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| ICS84329AVLFT | 700 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| ICS84329AYLFT | 700 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| ICS84329BV-01T | 700 MHz, OTHER CLOCK GENERATOR, PQCC28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS84329AVLFT | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84329AVT | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84329AY | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84329AYT | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84329B | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
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