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ASM3I1819N-08-ST PDF预览

ASM3I1819N-08-ST

更新时间: 2024-01-08 09:08:42
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
7页 353K
描述
Low Power Mobile VGA EMI Reduction IC

ASM3I1819N-08-ST 技术参数

生命周期:Obsolete包装说明:4.40 MM, TSSOP-8
Reach Compliance Code:unknown风险等级:5.77
Is Samacsys:NJESD-30 代码:R-PDSO-G8
长度:4.4 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:40 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主时钟/晶体标称频率:40 MHz
认证状态:Not Qualified座面最大高度:1.1 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:0.65 mm
端子位置:DUAL宽度:3 mm
uPs/uCs/外围集成电路类型:CLOCK GENERATOR, VIDEOBase Number Matches:1

ASM3I1819N-08-ST 数据手册

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August 2005  
rev 0.2  
ASM3P1819N  
Low Power Mobile VGA EMI Reduction IC  
Features  
The ASM3P1819N reduces electromagnetic interference  
(EMI) at the clock source, allowing a system wide EMI  
reduction for all the down stream clocks and data  
dependent signals. The ASM3P1819N allows significant  
system cost savings by reducing the number of circuit  
board layers, ferrite beads, shielding, and other passive  
components that are traditionally required to pass EMI  
regulations.  
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FCC approved method of EMI attenuation  
Provides up to 15dB EMI reduction  
Generates low EMI spread spectrum clock  
a
and a non-spread Reference Clock of the input  
frequency  
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Optimized for frequency range from 20MHz to  
40MHz  
Internal loop filter minimizes external components  
and board space  
The ASM3P1819N modulates the output of a single PLL in  
order to “spread” the bandwidth of a synthesized clock,  
thereby decreasing the peak amplitude of its harmonics.  
This result in significantly lower system EMI compared to  
the typical narrow band signal produced by oscillators and  
most clock generators.  
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Down Spread Deviation: -1.25%  
Low inherent Cycle-to-Cycle jitter  
3.3V Operating Voltage  
CMOS/TTL compatible inputs and outputs  
Low power CMOS design  
Lowering EMI by increasing a signal’s bandwidth is called  
“spread spectrum clock generation”. The ASM3P1819N  
uses the most efficient and optimized modulation profile  
approved by the FCC and is implemented by using a  
proprietary all digital method  
Supports notebook VGA and other LCD timing  
controller applications  
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Power Down function for mobile application  
Products are available for industrial temperature  
range.  
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Available in 8 pin SOIC and TSSOP Packages  
Applications  
The ASM3P1819N is targeted towards EMI management  
for memory and LVDS interfaces in mobile graphic chipsets  
and high-speed digital applications such as PC peripheral  
devices, consumer electronics and embedded controller  
system.  
Functional Description  
The ASM3P1819N is  
a
versatile spread spectrum  
frequency modulator designed specifically for a wide range  
of input clock frequencies from 20 to 40MHz. The  
ASM3P1819N can generate an EMI reduced clock from  
crystal, ceramic resonator, or system clock.  
PD#  
VDD  
Block Diagram  
PLL  
Modulation  
XIN  
Frequency  
Divider  
Crystal  
Oscillator  
Output  
Loop  
Filter  
Phase  
VCO  
Divider  
Detector  
Feedback  
Divider  
XOUT  
REF  
ModOUT  
VSS  
Alliance Semiconductor  
2575 Augustine Drive Santa Clara, CA Tel: 408.855.4900 Fax: 408.855.4999 www.alsc.com  
Notice: The information in this document is subject to change without notice.  

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