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| 型号： | ICS841S012DKILFT |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 4/23页 |
| 文件大小： | 0K |
| 描述： | IC FREQ SYNTHESIZER 56VFQFN |
| 标准包装： | 1,000 |
| 系列： | HiPerClockS™, PCI Express® (PCIe) |
| 类型： | 时钟/频率合成器，多路复用器 |
| PLL： | 是 |
| 主要目的： | PCI Express（PCIe） |
| 输入： | LVCMOS，LVTTL，晶体 |
| 输出： | HCSL，LVCMOS，LVTTL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:12 |
| 差分 - 输入:输出： | 是/无 |
| 频率 - 最大： | 250MHz |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘 |
| 供应商设备封装： | 56-VFQFP-EP（8x8） |
| 包装： | 带卷 (TR) |
ICS841S012BKI REVISION A NOVEMBER 10, 2009
12
2009 Integrated Device Technology, Inc.
ICS841S012I Data Sheet
CRYSTAL-TO-0.7V DIFFERENTIAL HCSL/LVCMOS FREQUENCY SYNTHESIZER
SPREAD SPECTRUM
Spread-spectrum clocking is a frequency modulation technique
for EMI reduction. When spread-spectrum is enabled, a 32kHz
triangle waveform is used with 0.6% down-spread (+0.0% / -
0.5%) from the nominal output frequency. An example of a tri-
angle frequency modulation profile is shown in
Figure 4A be-
low. The ramp profile can be expressed as:
Fnom = Nominal Clock Frequency in Spread OFF mode
Fm = Nominal Modulation Frequency (30kHz)
δ = Modulation Factor (0.6% down spread)
The ICS841S012BI triangle modulation frequency deviation
will not exceed 0.7% 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 4B. The ratio of this
width to the fundamental frequency is typically 0.4%, and will
not exceed 0.7%. The resulting spectral reduction will be greater
than 5dB, as shown in
Figure 4B. It is important to note the
ICS841S012DI 5dB minimum spectral reduction is the compo-
nent-specific EMI reduction, and will not necessarily be the
same as the system EMI reduction.
FIGURE 4B. 200MHZ CLOCK OUTPUT IN FREQUENCY DOMAIN
(A) SPREAD-SPECTRUM OFF (B) SPREAD-SPECTRUM ON
FIGURE 4A. TRIANGLE FREQUENCY MODULATION
(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
2Fm
1
2Fm
1
Fm
1/fm
0.5/fm
Fnom
(1 -
δ) Fnom
Frequency
Time
BA
Δ 10 dBm
δ = .6%
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS841S012I | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:Crystal-to-0.7V Differential HCSL/LVCMOS Frequency Synthesizer |
| ICS841S01BG | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
| ICS841S01BGLF | 功能描述:IC CLK GENERATOR PLL 16-TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:HiPerClockS™, PCI Express® (PCIe) 标准包装:1 系列:- 类型:时钟/频率发生器，多路复用器 PLL:是 主要目的:存储器，RDRAM 输入:晶体 输出:LVCMOS 电路数:1 比率 - 输入:输出:1:2 差分 - 输入:输出:无/是 频率 - 最大:400MHz 电源电压:3 V ~ 3.6 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:Digi-Reel® 其它名称:296-6719-6 |
| ICS841S01BGLFT | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
| ICS841S01BGT | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
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