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ASM3P2779AF-08ST

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
12页 176K
描述
Low Power Peak EMI Reducing Solution

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ASM3P2779AF-08ST 技术参数

是否Rohs认证： 符合生命周期：Transferred
包装说明：ROHS COMPLIANT, SOIC-8Reach Compliance Code：unknown
风险等级：5.76Is Samacsys：N
其他特性：ALSO OPERATES WITH 3.3V SUPPLYJESD-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峰值回流温度（摄氏度）：NOT SPECIFIED
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：2.625 V
最小供电电压：2.375 V标称供电电压：2.5 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
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：3.91 mm
uPs/uCs/外围集成电路类型：CLOCK GENERATOR, OTHERBase Number Matches：1

ASM3P2779AF-08ST 数据手册

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November 2006  
rev 3.2  
ASM3P2779A  
Low Power Peak EMI Reducing Solution  
Features  
The ASM3P2779A 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 3.3 / 2.5V Supply.  
Operating current less than 4mA.  
Low power CMOS design.  
Input frequency range: 13MHz to 30MHz for 2.5V.  
: 13MHz to 30MHz for 3.3V.  
Generates a 1X low EMI spread spectrum clock of  
the input frequency.  
Frequency deviation: ±1% (Typ) @16MHz Input  
Frequency.  
The ASM3P2779A 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  
Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin  
TSSOP packages.  
The ASM3P2779A is targeted towards all portable  
devices with very low power requirements like MP3  
players and digital still cameras.  
Product Description  
The ASM3P2779A is  
a versatile spread spectrum  
Key Specifications  
Description  
Supply voltages  
Cycle-to-Cycle Jitter  
Output Duty Cycle  
Modulation Rate Equation  
Frequency Deviation  
frequency modulator designed specifically for a wide  
range of clock frequencies. The ASM3P2779A reduces  
electromagnetic interference (EMI) at the clock source,  
allowing system wide reduction of EMI of all clock  
dependent signals. The ASM3P2779A allows significant  
system cost savings by reducing the number of circuit  
board layers ferrite beads, shielding that are traditionally  
required to pass EMI regulations.  
Specification  
VDD = 3.3V / 2.5V  
200pS (Max)  
45/55%  
FIN/640  
±1% (Typ) @ 16MHz  
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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