Datasheet > FS787BZ

FS787BZ

更新时间： 2024-11-17 23:52:55

品牌	Logo	应用领域
其他 - ETC		晶体时钟发生器外围集成电路光电二极管局域网
页数	文件大小	规格书
13页	96K
描述
MISCELLANEOUS CLOCK GENERATOR\|SOP\|8PIN\|PLASTIC

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FS787BZ 数据手册

APPROVED PRODUCT

FS786/787

Low EMI Spread Spectrum Clock

Features

Applications

•

Spread Spectrum Clock Generator (SSCG)

with 1x Spread and 1X non-Spread Output.

•

Desktop/Notebook Computers

Printers, Copiers and MFP

Scanners and Fax

•

6 to 82 MHz operating frequency range.

Modulates external clocks including crystals,

crystal oscillators and ceramic resonators.

LCD Displays and Monitors

CD-ROM, VCD and DVD

Automotive and Embedded Systems

Networking, LAN/WAN

•

Programmable modulation with simple

R-C external loop filter (LF)

Provides Two Output Clocks, One Modulated

and One Non-Modulated clock.

Digital Cameras and Camcorders

Modems

•

Center Spread Modulation.

3 - 5 Volt power supply.

TTL/CMOS compatible outputs.

Low short term jitter.

Benefits

•

Programmable EMI Reduction

Fast Time to Market

Low Power Dissipation;

Lower cost of compliance

3.3 VDC = 37 mW – typical

5.0 VDC = 115 mW - typical

No degradation in Rise/Fall times

Lower component and PCB layer count

•

Available in 8 pin SOIC package.

Product Description

The CYPRESS FS786/787 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 FS786/787 devices have a simple frequency

selection table that allows operation from 6 MHz to

82 MHz in two separate ranges and two separate

parts. 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 FS786/787 SSCG clocks use an Cypress

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 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 FS786/787 products. 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 CYPRESS FS786/787 clocks are very simple

and versatile devices to use. Range selection is

performed via one pin, D0. The FS786/787 are

designed to operate over a very wide range of input

frequencies and provide one modulated and one

non-modulated output.

Refer to FS791/2/4 products for applications

requiring 80 to 140 MHz frequency range.

Cypress Semiconductor Corporation

525 Los Coches St.

Document#: 38-07031 Rev. **

05/04/2001

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

http://www.cypress

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与FS787BZ相关器件

型号	品牌	获取价格	描述	数据表
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
FS794	CYPRESS	获取价格	Low EMI Spectrum Spread Clock
FS794BZB	CYPRESS	获取价格	Clock Generator, CMOS, PDSO8, 0.150 INCH, SOIC-8
FS7BCAJC25.0	FOX	获取价格	HCMOS Output Clock Oscillator,
FS7BCALC25.0	FOX	获取价格	HCMOS Output Clock Oscillator,
FS7BCAMC1.0	FOX	获取价格	HCMOS Output Clock Oscillator,

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