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ASM3I2508AG-08ST PDF预览

ASM3I2508AG-08ST

更新时间: 2024-11-24 06:38:07
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
9页 396K
描述
Peak EMI Reducing Solution

ASM3I2508AG-08ST 技术参数

生命周期:Obsolete包装说明:0.150 INCH, GREEN, SOIC-8
Reach Compliance Code:unknown风险等级:5.77
Is Samacsys:NJESD-30 代码:R-PDSO-G8
长度:4.9 mm端子数量:8
最高工作温度:85 °C最低工作温度:-40 °C
最大输出时钟频率:120 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:14.31818 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:INDUSTRIAL
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL宽度:3.91 mm
uPs/uCs/外围集成电路类型:CLOCK GENERATOR, OTHERBase Number Matches:1

ASM3I2508AG-08ST 数据手册

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February 2007  
rev 1.4  
ASM3P2508A  
Peak EMI Reducing Solution  
Features  
The ASM3P2508A allows significant system cost savings  
by reducing the number of circuit board layers and  
shielding that are required to pass EMI regulations. The  
ASM3P2508A modulates the output of 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.  
Generates an EMI optimized clocking signal at  
output.  
Input frequency – 14.31818MHz.  
Frequency outputs:  
120MHz (modulated) - default.  
72MHz (modulated) or 48MHz (modulated)  
selectable via I2C  
± 1% Centre spread.  
Modulation rate: 40KHz.  
Byte Write via I2C  
Supply voltage range 3.3V ± 0.3V.  
Available in 8-pin SOIC Package.  
Available in Commercial and Industrial  
Temperature ranges.  
The ASM3P2508A has a feature to power down the  
72MHz/48MHz output by writing data into specific  
registers in the device via I2C. By writing a ‘0’ into bit 1 of  
Byte 0, the PLL block generating 72MHz / 48MHz can be  
powered down. Writing ‘0’ into bit ‘7’ of Byte 1 selects an  
output of 72 MHz on FOUT2CLK while a ‘1’ at the same  
location selects a 48 MHz clock output. However, the I2C  
block, crystal oscillator, and the PLL block generating  
120MHz would be always running.  
Product Description  
The ASM3P2508A is  
a versatile spread spectrum  
frequency modulator. The ASM3P2508A reduces  
electromagnetic interference (EMI) at the clock source.  
Block Diagram  
VDD  
XIN  
XOUT  
Crystal  
PLL 1  
Oscillator  
FOUT1CLK  
(120MHz)  
SCL  
SDA  
I2C  
PLL 2  
FOUT2CLK  
Interface  
(72 MHz / 48MHz)  
V
SS  
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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