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ASM3I2531A-08SR PDF预览

ASM3I2531A-08SR

更新时间: 2024-01-04 04:43:57
品牌 Logo 应用领域
ALSC 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
8页 190K
描述
Low Frequency EMI Reduction

ASM3I2531A-08SR 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
包装说明:4.40 MM, TSSOP-8Reach Compliance Code:unknown
风险等级:5.86Is Samacsys:N
JESD-30 代码:R-PDSO-G8JESD-609代码:e0
长度:4.4 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:55 MHz封装主体材料:PLASTIC/EPOXY
封装代码:TSSOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度(摄氏度):NOT SPECIFIED
主时钟/晶体标称频率:55 MHz认证状态:Not Qualified
座面最大高度:1.1 mm最大供电电压:5.5 V
最小供电电压:2.7 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:TIN LEAD
端子形式:GULL WING端子节距:0.65 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 mmuPs/uCs/外围集成电路类型:CLOCK GENERATOR, OTHER
Base Number Matches:1

ASM3I2531A-08SR 数据手册

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November 2003  
rev 1.0  
ASM3P2531A  
Features  
dependent signals. It allows significant system cost  
FCC approved method of EMI attenuation.  
savings by reducing the number of circuit board layers  
and shielding traditionally required to pass EMI  
regulations.  
Generates a low EMI spread spectrum of the  
input clock frequency.  
Optimized for input frequency range between  
35MHz – 55MHz.  
The ASM3P2531A modulates the output of a single PLL  
in order to spread the bandwidth of a synthesized clock,  
thereby decreasing 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 clock generators. Lowering EMI by increasing  
a signal’s bandwidth is called spread spectrum clock  
generation.  
Internal loop filter minimizes external  
components and board space.  
Frequency Deviation: ±1.65%.  
Low inherent cycle-to-cycle jitter.  
3.3 V or 5 V operating voltage.  
CMOS/TTL compatible inputs and outputs.  
Ultra low power CMOS design: 5.50 mA @3.3 V.  
Supports notebook VGA and other LCD timing  
controller applications.  
The ASM3P2531A uses the most efficient and optimized  
modulation profile approved by the FCC and is  
Available in 8-pin SOIC and TSSOP.  
implemented by using a proprietary all-digital method.  
Product Description  
The ASM3P2531A is a versatile spread spectrum  
frequency modulator designed specifically for a wide  
range of clock frequencies. It reduces electromagnetic  
interference (EMI) at the clock source allowing system-  
wide reduction of EMI of downstream clock and data  
Applications  
The ASM3P2531A is targeted toward the notebook VGA  
chip and other displays using an LVDS interface, PC  
peripheral devices, and embedded systems  
Block Diagram  
STOP  
VDD  
PLL  
Modulation  
CLKIN  
Crystal  
Oscillator  
Frequency  
Divider  
Output  
Divider  
Phase  
Detector  
Loop  
Filter  
VCO  
Feedback  
Divider  
MODOUT  
VSS  
Low Frequency EMI Reduction  
1 of 8  
Notice: The information in this document is subject to change without notice.  

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