参数资料
| 型号： | CYW150OXCT |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC CLOCK 440BX AGP 56SSOP |
| 标准包装： | 1,000 |
| 类型： | 时钟/频率合成器，扩展频谱时钟发生器 |
| PLL： | 是 |
| 主要目的： | Intel CPU 服务器 |
| 输入： | 时钟，晶体 |
| 输出： | 时钟 |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:33 |
| 差分 - 输入:输出： | 无/无 |
| 频率 - 最大： | 150MHz |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-BSSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 56-SSOP |
| 包装： | 带卷 (TR) |
CYW150
........................ Document #: 38-07177 Rev. *B Page 4 of 14
Spread Spectrum Generator
The device generates a clock that is frequency modulated in
order to increase the bandwidth that it occupies. By increasing
the bandwidth of the fundamental and its harmonics, the ampli-
tudes of the radiated electromagnetic emissions are reduced.
This effect is depicted in Figure 3.
As shown in Figure 3, a harmonic of a modulated clock has a
much lower amplitude than that of an unmodulated signal. The
reduction in amplitude is dependent on the harmonic number
and the frequency deviation or spread. The equation for the
reduction is
dB = 6.5 + 9*log10(P) + 9*log10(F)
Where P is the percentage of deviation and F is the frequency
in MHz where the reduction is measured.
The output clock is modulated with a waveform depicted in
Figure 4. This waveform, as discussed in “Spread Spectrum
Clock Generation for the Reduction of Radiated Emissions” by
Bush, Fessler, and Hardin produces the maximum reduction
in the amplitude of radiated electromagnetic emissions. The
details the Cypress spreading pattern. Cypress does offer
options with more spread and greater EMI reduction. Contact
your local Sales representative for details on these devices.
Spread Spectrum clocking is activated or deactivated by
selecting the appropriate values for bits 1–0 in data byte 0 of
the SMBus data stream. Refer to Table 7 for more details.
Power-on
Reset
Timer
Output Three-state
Data
Latch
Hold
QD
CYW150
VDD
Clock Load
R
10 k
Output
Buffer
Output
Low
Output Strapping Resistor
Series Termination Resistor
Jumper Options
Resistor Value R
Figure 2. Input Logic Selection Through Jumper Option
Figure 3. Clock Harmonic with and without SSCG Modulation Frequency Domain Representation
SSFTG
Typical Clock
Frequency Span (MHz)
–1.0
+1.0
0
–0.5%
–SS%
+SS%
Ampl
it
ude
(
d
B
)
5 dB/div
+0.5%
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CYW152-12G | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CYW15G0101DXB | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Single-channel HOTLink II⑩ Transceiver |
| CYW15G0101DXB-BBC | 功能描述:电信线路管理 IC Sngl Ch XCVR COM RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| CYW15G0101DXB-BBI | 功能描述:电信线路管理 IC Sngl Ch XCVR IND RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| CYW15G0101DXB-BBXC | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Single-channel HOTLink II⑩ Transceiver |
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