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| 型號(hào)： | IMISG570CYB |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | SSOP-48 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 176K |
| 代理商： | IMISG570CYB |
SG570
I
2C Frequency Clock Generator w/ EMI Reduction Spread Spectrum Technology
for Pentium Processor Based Designs.
Preliminary
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.1
3/23/98
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 8 of 14
Spread Spectrum Clock Generation (SSCG)
Spread Spectrum is a modulation technique applied here for maximum efficiency in minimizing Electro-
Magnetic Interference radiation generated from repetitive digital signals mainly clocks.
A clock accumulates EM
energy at the center frequency it is generating.
Spread Spectrum distributes this energy over a small frequency
bandwidth therefore spreading the same amount of energy over a spectrum. This technique is achieved by modulating
the clock down from its resting frequency by a certain percentage (which also determines the energy distribution
bandwidth). In this product, the modulation is 1.0% down from the resting frequency.
Amplitude
(dB
)
Frequency(MHz
)
Modulated Center
Frequency
Without Spectrum Spread
With Spectrum Spread
Spectrum Analysis
Rested Center
frequency
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