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ASM3P2775AF-08SR

更新时间： 2024-11-18 06:38:11
品牌 Logo 应用领域
PULSECORE 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 364K
描述
Low Power Peak EMI Reducing Solution

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ASM3P2775AF-08SR 技术参数

生命周期：Transferred包装说明：ROHS COMPLIANT, SOIC-8
Reach Compliance Code：unknown风险等级：5.77
JESD-30 代码：R-PDSO-G8长度：4.9 mm
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：30 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
主时钟/晶体标称频率：30 MHz认证状态：Not Qualified
座面最大高度：1.75 mm最大供电电压：3.6 V
最小供电电压：3 V标称供电电压：3.3 V
表面贴装：YES技术：CMOS
温度等级：COMMERCIAL端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
宽度：3.91 mmuPs/uCs/外围集成电路类型：CLOCK GENERATOR, OTHER
Base Number Matches：1

ASM3P2775AF-08SR 数据手册

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November 2006  
rev 0.3  
ASM3P2775A  
Low Power Peak EMI Reducing Solution  
Features  
The ASM3P2775A uses the most efficient and optimized  
modulation profile approved by the FCC and is  
implemented by using a proprietary all digital method.  
•
Generates an EMI optimized clock signal at the  
output.  
•
•
•
•
•
•
Integrated loop filter components.  
Operates with a 3.3V Supply.  
Operating current less than 4mA.  
Low power CMOS design.  
Input frequency range: 13MHz to 30MHz  
Generates a 1X low EMI spread spectrum clock  
of the input frequency.  
Frequency deviation: ±1.75% (Typ) @14.7MHz  
Input Frequency.  
Available in 6-pin TSOT-23, 8-pin SOIC and 8-  
pin TSSOP packages.  
The ASM3P2775A modulates the output of a single PLL  
in order to “spread” the bandwidth of a synthesized clock,  
and more importantly, decreases the peak amplitudes of  
its harmonics. This results in significantly lower system  
EMI compared to the typical narrow band signal produced  
by oscillators and most frequency generators. Lowering  
EMI by increasing a signal’s bandwidth is called ‘spread  
spectrum clock generation’.  
•
•
Applications  
The ASM3P2775A is targeted towards all portable  
devices with very low power requirements like MP3  
players and digital still cameras.  
Product Description  
The ASM3P2775A is  
a versatile spread spectrum  
frequency modulator designed specifically for a wide  
range of clock frequencies. The ASM3P2775A reduces  
electromagnetic interference (EMI) at the clock source,  
allowing system wide reduction of EMI of all clock  
dependent signals. The ASM3P2775A allows significant  
system cost savings by reducing the number of circuit  
board layers, ferrite beads and shielding that are  
traditionally required to pass EMI regulations.  
Key Specifications  
Description  
Supply voltages  
Cycle-to-Cycle Jitter  
Output Duty Cycle  
Modulation Rate Equation  
Frequency Deviation  
Specification  
VDD = 3.3V ± 0.3V  
200pS (Max)  
45/55% (worst case)  
FIN/640  
±1.75% (Typ) @ 14.7MHz  
Block Diagram  
VDD  
PD  
PLL  
Modulation  
XIN/CLKIN  
XOUT  
Crystal  
Frequency  
Divider  
Oscillator  
Output  
Divider  
Phase  
Loop  
Filter  
VCO  
Detector  
Feedback  
Divider  
ModOUT  
VSS  
PulseCore Semiconductor Corporation  
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018  
www.pulsecoresemi.com  
Notice: The information in this document is subject to change without notice.  
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