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参数资料
| 型号： | ICS8431CM-11LFT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 255 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| 封装： | 7.50 X 18.05, 2.25 MM HEIGHT, SOIC-28 |
| 文件页数： | 18/18页 |
| 文件大小： | 2136K |
| 代理商： | ICS8431CM-11LFT |
8431CM-11
www.icst.com/products/hiperclocks.html
REV. B AUGUST 7, 2002
9
Integrated
Circuit
Systems, Inc.
ICS8431-11
255MHZ, LOW JITTER, CRYSTAL OSCILLATOR-
TO
-3.3V LVPECL FREQUENCY SYNTHESIZER
The ICS8431-11 features an internal oscillator that uses an
external quartz crystal as the source of its reference frequency.
A 16MHz crystal divided by 16 before being sent to the phase
detector provides the 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 parallel resonant crystal in
series to pin 25.
Figure 1A shows how to interface with a crystal.
Figures 1A, 1B, and 1C show various crystal parameters which
are recommended only as guidelines.
Figure 1A shows how to
interface a capacitor with an 18pF parallel resonant crystal.
Fig-
ure 1B shows the capacitor value needed for the optimum ppm
performance over various parallel resonant crystals.
Figure 1C
shows the recommended tuning capacitance for a various par-
allel resonant crystal.
FIGURE 1A - CRYSTAL INTERFACE
Optional
XTAL2
(Pin 26, SOIC)
XTAL1
(Pin 25, SOIC)
ICS8431-11
FIGURE 1B. Recommended tuning capacitance for various
18pF parallel resonant crystals.
FIGURE 1C. Recommended tuning capacitance for various
18pF parallel resonant crystals.
14.318
15.000
16.667
24.000
19.440
20.000
0
10
20
30
40
50
60
14
15
16
17
18
19
20
21
22
23
24
25
Crystal Frequency (MHz)
S
e
ri
es
C
apac
itor
,C
1
(
p
F
)
-100
-80
-60
-40
-20
0
20
40
60
80
100
0
1020
30
4050
60
Series Capacitor, C1 (pF)
F
requency
A
ccur
a
cy
(
ppm
)
19.44MHz
16MHz
15.00MHz
CRYSTAL INPUT AND OSCILLATOR INTERFACE
APPLICATION INFORMATION
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| ICS8431DMI-01LFT | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431DMI-01 | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431EM-01 | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS8431CM-11T | 制造商:ICS 制造商全称:ICS 功能描述:255MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431EM11 | 制造商:ICS 功能描述: |
| ICS8431I-21 | 制造商:ICS 制造商全称:ICS 功能描述:350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS84320-01 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84320-01K | 制造商:ICS 制造商全称:ICS 功能描述:780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
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