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CYW180-03SX

更新时间： 2024-01-07 08:33:51

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		晶体时钟发生器微控制器和处理器外围集成电路光电二极管
页数	文件大小	规格书
10页	183K
描述
Peak Reducing EMI Solution

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技术参数
数据手册

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CYW180-03SX 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOP,	针数：	8
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.38
其他特性：	ALSO OPERATES AT 5V SUPPLY	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.889 mm
湿度敏感等级：	1	端子数量：	8
最高工作温度：	70 °C	最低工作温度：
最大输出时钟频率：	28 MHz	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
主时钟/晶体标称频率：	28 MHz	认证状态：	Not Qualified
座面最大高度：	1.727 mm	最大供电电压：	3.465 V
最小供电电压：	3.135 V	标称供电电压：	3.3 V
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	端子面层：	MATTE TIN
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	3.8985 mm	uPs/uCs/外围集成电路类型：	CLOCK GENERATOR, OTHER
Base Number Matches：	1

CYW180-03SX 数据手册

W180

Where P is the percentage of deviation and F is the frequency

in MHz where the reduction is measured.

Spread Spectrum Frequency Timing

Generation

The output clock is modulated with a waveform depicted in

Figure 3. 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.

Figure 3 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.

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 2.

As shown in Figure 2, 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)

EMI Reduction

SSFTG

Typical Clock

Spread

Spectrum

Enabled

Non-

Spread

Spectrum

Frequency Span (MHz)

Down Spread

Frequency Span (MHz)

Center Spread

Figure 2. Clock Harmonic with and without SSCG Modulation Frequency Domain Representation

MAX.

MIN.

Figure 3. Typical Modulation Profile

Document #: 38-07156 Rev. *B

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