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参数资料
| 型号： | ICS8431EM-01 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| 封装： | 7.50 X 18.05 MM, 2.25 MM, MS-013, MO-119, SOIC-28 |
| 文件页数： | 12/15页 |
| 文件大小： | 317K |
| 代理商： | ICS8431EM-01 |
8431EM-01
www.icst.com/products/hiperclocks.html
REV. D JUNE 20, 2003
6
Integrated
Circuit
Systems, Inc.
ICS8431-01
200MHZ, LOW JITTER,
CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
The ICS8431-01 features an internal oscillator that uses an
external quartz crystal as the source of its reference frequency.
A 16.666MHz 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 a parallel resonant crystal.
Figure 1B
shows the capacitor value needed for the optimum ppm perfor-
mance over various parallel resonant crystals.
Figure 1C shows
the recommended tuning capacitance for a 16.666MHz parallel
resonant crystals.
Quartz Crystal Selection:
(1) Raltron Series Resonant: AS-16.66-S-SMD-T-MI
(2) Raltron Parallel Resonant: AS-16.66-18-SMD-T-MI
FIGURE 1A. CRYSTAL INTERFACE
Optional
XTAL2
(Pin 26, SOIC)
XTAL1
(Pin 25, SOIC)
ICS8431-01
FIGURE 1B. Recommended tuning capacitance for various parallel
resonant crystals.
FIGURE 1C. Recommended tuning capacitance for 16.666MHz
parallel resonant crystal.
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
)
16.666MHz
-100
-80
-60
-40
-20
0
20
40
60
80
100
0
1020
3040
5060
Series Capacitor, C1 (pF)
F
requenc
y
A
c
u
ra
c
y
(
ppm)
APPLICATION INFORMATION
CRYSTAL INPUT AND OSCILLATOR INTERFACE
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| ICS8431EM-01LF | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ICS843201AG-375LF | 功能描述:IC SYNTHESIZER 375MHZ 16-TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™, FemtoClock™ 标准包装:27 系列:Precision Edge® 类型:频率合成器 PLL:是 输入:PECL，晶体 输出:PECL 电路数:1 比率 - 输入:输出:1:1 差分 - 输入:输出:无/是 频率 - 最大:800MHz 除法器/乘法器:是/无 电源电压:3.135 V ~ 5.25 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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