Datasheet > W150H

W150H

更新时间： 2024-02-18 15:48:56

品牌	Logo	应用领域
SPECTRALINEAR		晶体外围集成电路光电二极管时钟
页数	文件大小	规格书
14页	231K
描述
440BX AGPset Spread Spectrum Frequency Synthesizer

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技术参数
数据手册

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W150H 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8541.40.20.00
风险等级：	5.33	其他特性：	IC COMPATIBLE, HIGH RELIABILITY
颜色：	HIGH EFFICIENCY RED/YELLOW	颜色@波长：	Orange/Yellow
配置：	COMMON CATHODE, 2 ELEMENTS	最大正向电流：	0.03 A
最大正向电压：	2.5 V	透镜类型：	DIFFUSED WHITE
标称发光强度：	60.0/40.0 mcd	安装特点：	RADIAL MOUNT
功能数量：	1	端子数量：	3
最高工作温度：	85 °C	最低工作温度：	-40 °C
光电设备类型：	DUAL COLOR LED	总高度：	6.22 mm
包装方法：	BULK	峰值波长：	627/590 nm
最大反向电压：	5 V	形状：	ROUND
尺寸：	5 mm	子类别：	Visible LEDs
表面贴装：	NO	T代码：	T-1 3/4
端子节距：	1.27 mm	视角：	60 deg
Base Number Matches：	1

W150H 数据手册

W150

Jumper Options

Output Strapping Resistor

Series Termination Resistor

V_DD

10 k

Clock Load

W150

Output

Buffer

Power-on

Reset

Timer

Resistor Value R

Hold

Output

Low

Output Three-state

Data

Latch

Figure 2. Input Logic Selection Through Jumper Option

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

in MHz where the reduction is measured.

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.

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

deviation selected for this chip is specified in Table 6. Figure 4

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.

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

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.

dB = 6.5 + 9*log10(P) + 9*log10(F)

5 dB/div

SSFTG

Typical Clock

–1.0

+1.0

+0.5%

–0.5%

–SS%

Frequency Span (MHz)

+SS%

Figure 3. Clock Harmonic with and without SSCG Modulation Frequency Domain Representation

Rev 1.0,November 24, 2006

Page 4 of 14

1 2 345 6 7...14

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与W150H相关器件

型号	品牌	描述	获取价格	数据表
W150HT	SPECTRALINEAR	440BX AGPset Spread Spectrum Frequency Synthesizer	获取价格
W150HT	CYPRESS	440BX AGPset Spread Spectrum Frequency Synthesizer	获取价格
W150LVS/EGW	KINGBRIGHT	Dual Color LED, High Efficiency Red/green, Diffused White, T-1 3/4, 5mm,	获取价格
W150LVS/EYW	KINGBRIGHT	Dual Color LED, High Efficiency Red/yellow, Diffused White, T-1 3/4, 5mm,	获取价格
W1512	3M	MALE, STRAIGHT TWO PART BOARD CONNECTOR, SURFACE MOUNT	获取价格
W151208-2390-TH	3M	Board Connector, 8 Contact(s), 2 Row(s), Male, Straight, 0.079 inch Pitch, Black Insulator	获取价格

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