Datasheet > FS784BT

FS784BT

更新时间： 2024-11-17 23:52:55

品牌	Logo	应用领域
其他 - ETC		时钟发生器局域网
页数	文件大小	规格书
13页	106K
描述
MISCELLANEOUS CLOCK GENERATOR\|TSSOP\|8PIN\|PLASTIC

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FS784BT 数据手册

APPROVED PRODUCT

FS781/82/84

LOW EMI SPECTRUM SPREAD CLOCK

•

Desktop/Notebook Computers

Printers, Copiers and MFP

Scanners and Fax

Features

•

Spread Spectrum Clock Generator (SSCG)

with 1x, 2x and 4x Outputs

•

6 to 82 MHz operating frequency range.

LCD Displays and Monitors

CD-ROM, VCD and DVD

Automotive and Embedded Systems

Networking, LAN/WAN

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.

Digital Cameras and Camcorders

Modems

•

TTL/CMOS compatible outputs.

Low short term jitter.

Benefits

•

Programmable EMI Reduction

Low Power Dissipation;

Fast Time to Market

3.3 VDC = 37 mw - typical

5.0 VDC = 115 mw - typical

Lower cost of compliance

No degradation in Rise/Fall times

Lower component and PCB layer count

•

Available in 8 pin SOIC and TSSOP

packages.

Applications

Product Description

The Cypress FS781/2/4 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 FS781/2/4 SSCG clocks use an IMI proprietary technology to modulate the input clock frequency, FS^OUTby

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 Cypress FS781/2/4 clocks are very simple and versatile devices to use. By programming the two range

select lines, S0 and S1, any frequency from 6 to 82 MHz operating range can be selected. The FS781/2/4 are

designed to operate over a very wide range of input frequencies and provides 1x, 2x and 4x modulated clock

outputs.

The FS78x devices have a simple frequency selection table that allows operation from 6 MHz to 82 MHz in four

separate ranges. The bandwidth of the frequency spread at FSOUT is determined by the values of the loop filter

components. The modulation rate is determined internally by the input frequency and the selected input frequency

range.

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 6 for recommended values. Due to a

wide range of application requirements, an external loop filter (LF) is used on the FS78x products. The user can

select the exact amount of frequency modulation suitable for the application. Using a fix internal loop filter would

severely limit the use of a wide range of modulation bandwidths (Spread %) to a few discrete values.

Refer to FS791/2/4 products for applications requiring 80 to 140 MHz frequency range.

Cypress Semiconductor Corporation

525 Los Coches St.

Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571

http://www.cypress.com

Document#: 38-07029 Rev. **

05/07/2001

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与FS784BT相关器件

型号	品牌	获取价格	描述	数据表
FS784BTB	CYPRESS	获取价格	Clock Generator, CMOS, PDSO8, 0.169 INCH, TSSOP-8
FS784BZB	CYPRESS	获取价格	Clock Generator, 82MHz, CMOS, PDSO8, 0.150 INCH, MS-012, SOIC-8
FS784BZBT	CYPRESS	获取价格	Clock Generator, 82MHz, CMOS, PDSO8, 0.150 INCH, MS-012, SOIC-8
FS786BZ	ETC	获取价格	MISCELLANEOUS CLOCK GENERATOR\|SOP\|8PIN\|PLASTIC
FS787BZ	ETC	获取价格	MISCELLANEOUS CLOCK GENERATOR\|SOP\|8PIN\|PLASTIC
FS791	CYPRESS	获取价格	Low EMI Spectrum Spread Clock
FS791/92/94	ETC	获取价格	Clocks and Buffers
FS791BZB	CYPRESS	获取价格	Clock Generator, CMOS, PDSO8, 0.150 INCH, SOIC-8
FS792	CYPRESS	获取价格	Low EMI Spectrum Spread Clock
FS792BZB	CYPRESS	获取价格	Clock Generator, CMOS, PDSO8, 0.150 INCH, SOIC-8

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