- 您现在的位置：买卖IC网 > PDF目录67690 > ICS8431DMI-01 200 MHz, OTHER CLOCK GENERATOR, PDSO28 PDF资料下载
参数资料
| 型号： | ICS8431DMI-01 |
| 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 X 2.25 MM, MS-013, MO-119, SOIC-28 |
| 文件页数： | 13/15页 |
| 文件大小： | 323K |
| 代理商： | ICS8431DMI-01 |
8431DMI-01
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 4, 2003
7
Integrated
Circuit
Systems, Inc.
ICS8431I-01
200MHZ, LOW JITTER,
CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
10 dBm
δ = .4%
B
A
Spread-spectrum clocking is a frequency modulation tech-
nique for EMI reduction. When spread-spectrum is enabled, a
30KHz triangle waveform is used with 0.5% down-spread
(+0.0% / -0.5%) from the nominal 200MHz clock frequency.
An example of a triangle frequency modulation profile is shown
in
Figure 2A below. The ramp profile can be expressed as:
Fnom = Nominal Clock Frequency in Spread OFF mode
(200MHz with 16.666MHz IN)
Fm = Nominal Modulation Frequency (30KHz)
δ = Modulation Factor (0.5% down spread)
(1 -
δ) fnom + 2 fm x δ x fnom x t when 0 < t <
,
(1 -
δ) fnom - 2 fm x δ x fnom x t when
< t <
1
2 fm
1
2 fm
1
fm
The ICS8431I-01 triangle modulation frequency deviation will
not exceed 0.6% down-spread from the nominal clock fre-
quency (+0.0% / -0.5%). An example of the amount of down
spread relative to the nominal clock frequency can be seen in
the frequency domain, as shown in
Figure 2A. The ratio of this
width to the fundamental frequency is typically 0.4%, and will
not exceed 0.6%. The resulting spectral reduction will be
greater than 7dB, as shown in
Figure 2B. It is important to
note the ICS8431I-01 7dB minimum spectral reduction is the
component-specific EMI reduction, and will not necessarily
be the same as the system EMI reduction.
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8431I-01 provides
separate power supplies to isolate any high switching noise
from the outputs to the internal PLL. V
CC, VCCA, and VCCO should
be individually connected to the power supply plane through
vias, and bypass capacitors should be used for each pin. To
achieve optimum jitter performance, better power supply iso-
lation is required.
Figure 3 illustrates how a 10
along with a
10
F and a .01F bypass capacitor should be connected to
each V
CCA pin.
FIGURE 2B. 200MHZ CLOCK OUTPUT IN FREQUENCY DOMAIN
(A) SPREAD-SPECTRUM OFF
(B) SPREAD-SPECTRUM ON
Fnom
(1 -
δ) Fnom
0.5/fm
1/fm
FIGURE 2A. TRIANGLE FREQUENCY MODULATION
FIGURE 3. POWER SUPPLY FILTERING
10
V
CCA
10
F
.01
F
3.3V
.01
F
V
CC
POWER SUPPLY FILTERING TECHNIQUES
SPREAD SPECTRUM
相关PDF资料 |
PDF描述 |
|---|---|
| ICS8431DMI-01LFT | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431DMI-01 | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431EM-01 | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431EM-01LF | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431EM-11 | 255 MHz, OTHER CLOCK GENERATOR, PDSO28 |
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 |
发布紧急采购，3分钟左右您将得到回复。