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FS791BZB

更新时间： 2024-11-19 08:33:19
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 光电二极管
页数 文件大小 规格书
10页 109K
描述
Clock Generator, CMOS, PDSO8, 0.150 INCH, SOIC-8

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FS791BZB 数据手册

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IMI-FS79/1/2/4  
LOW EMI SPECTRUM SPREAD CLOCK  
Approved Product  
Features  
Applications  
•
Spread Spectrum Clock Generator (SSCG)  
with 1x, 2x and 4x Outputs  
•
•
•
•
•
•
•
Desktop/Notebook Computers  
VGA, XGA and SXGA LCD Displays  
High Speed Printers and Copiers  
CD-ROM, VCD and DVD  
Embedded Systems  
•
•
80 to 140 MHz operating frequency range.  
Modulates external clocks including crystals,  
crystal oscillators and ceramic resonators.  
•
Programmable modulation with simple  
R-C external loop filter (LF)  
Center Spread Modulation.  
3 - 5 Volt power supply.  
Networking, LAN/WAN  
Modems  
•
•
•
•
•
Benefits  
TTL/CMOS compatible outputs.  
Low short term jitter.  
•
•
•
•
•
Programmable EMI Reduction  
Fast Time to Market  
Low Power Dissipation;  
Lower cost of compliance  
3.3 VDC = 73 mw - typical  
5.0 VDC = 225 mw - typical  
Available in 8 pin SOIC package.  
No degradation in Rise/Fall times  
Lower component and PCB layer count  
•
Product Description  
internally by the input frequency and the selected  
input frequency range.  
The IMI FS791/2/4 are Spread Spectrum Clock  
Generator ICs (SSCG) designed for the purpose of  
reducing Electro Magnetic Interference (EMI) found  
in today’s high-speed digital systems.  
The Bandwidth of these products can be  
programmed from as little as 0.6% up to as much as  
4.0% by selecting the proper loop filter value. Refer  
to the Loop Filter Selection chart on page 5 for  
recommended values. Due to a wide range of  
application requirements, an external loop filter (LF)  
is used on the FS79x products.  
The FS791/2/4 SSCG clocks use an IMI proprietary  
technology to modulate the input clock frequency,  
FSOUT by modulating the frequency of the digital  
clock. By modulating the reference clock the  
measured EMI at the fundamental and harmonic  
frequencies of FSOUT is greatly reduced. This  
reduction in radiated energy can significantly reduce  
the cost of complying with regulatory requirements  
without degrading digital waveforms.  
The user can select the exact amount of frequency  
modulation suitable for the application.  
Using a  
fixed internal loop filter would severely limit the use  
of a wide range of modulation bandwidths (Spread  
%) to a few discrete values.  
The FS791/2/4 are designed to operate over a very  
wide range of input frequencies and provides 1x, 2x  
and 4x modulated clock outputs.  
The IMI FS791/2/4 Spread Spectrum Clock  
Generator (SSCG) products are versatile devices to  
use in a wide range of applications.  
Refer to FS781/2/4 products for applications  
requiring 6 to 82 MHz frequency range.  
The bandwidth of the frequency spread at FSOUT is  
determined by the values of the loop filter  
components. The modulation rate is determined  
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.  
MILPITAS, CA 95035 (408) 263-6300 FAX: (408) 263-6571  
http://www.imicorp.com  
Rev 1.1  
7/20/1999  
Page 1 of 10  
1234567...10

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