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ASM3I2508A-08-SR PDF预览

ASM3I2508A-08-SR

更新时间: 2024-02-07 08:40:28
品牌 Logo 应用领域
ALSC 晶体外围集成电路光电二极管时钟
页数 文件大小 规格书
11页 3688K
描述
Peak EMI Reducing Solution

ASM3I2508A-08-SR 技术参数

是否Rohs认证: 不符合生命周期:Transferred
零件包装代码:SOIC包装说明:SOP,
针数:8Reach Compliance Code:unknown
风险等级:5.48Is Samacsys:N
JESD-30 代码:R-PDSO-G8JESD-609代码:e0
长度:4.89 mm端子数量:8
最高工作温度:70 °C最低工作温度:-10 °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峰值回流温度(摄氏度):NOT SPECIFIED
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温度等级:COMMERCIAL
端子面层:TIN LEAD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:3.905 mm
uPs/uCs/外围集成电路类型:CLOCK GENERATOR, OTHERBase Number Matches:1

ASM3I2508A-08-SR 数据手册

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February 2005  
rev 1.3  
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 – 14.31818 MHz.  
Frequency outputs:  
o
o
120 MHz (modulated) - default.  
72 MHz (modulated) or 48 MHz  
(modulated) selectable via I2C  
± 1% Centre spread.  
Modulation rate: 40 KHz.  
Byte Write via I2C  
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 72 MHz / 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.  
Supply voltage range 3.3V ± 0.3V.  
Available in 8-pin SOIC Package.  
Available in Commercial and Industrial  
Temperature ranges.  
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  
Crystal  
Oscillator  
PLL 1  
XOUT  
FOUT1CLK  
(120 MHz)  
SCL  
I2C  
Interface  
PLL 2  
FOUT2CLK  
(72 MHz / 48 MHz)  
SDA  
VSS  
Alliance Semiconductor  
2575 Augustine Drive Santa Clara CA Tel: 408-855-4900 Fax: 408-855-4999 www.alsc.com  

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