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FS781BT Datasheet

  • FS781BT

  • MISCELLANEOUS CLOCK GENERATOR|TSSOP|8PIN|PLASTIC

  • 13頁

  • ETC

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APPROVED PRODUCT
FS781/82/84
LOW EMI SPECTRUM SPREAD CLOCK
Features
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Spread Spectrum Clock Generator (SSCG)
with 1x, 2x and 4x Outputs
6 to 82 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.
TTL/CMOS compatible outputs.
Low short term jitter.
Low Power Dissipation;
3.3 VDC = 37 mw - typical
5.0 VDC = 115 mw - typical
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Available in 8 pin SOIC and TSSOP
packages.
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Desktop/Notebook Computers
Printers, Copiers and MFP
Scanners and Fax
LCD Displays and Monitors
CD-ROM, VCD and DVD
Automotive and Embedded Systems
Networking, LAN/WAN
Digital Cameras and Camcorders
Modems
Benefits
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Programmable EMI Reduction
Fast Time to Market
Lower cost of compliance
No degradation in Rise/Fall times
Lower component and PCB layer count
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鈥檚 high-speed digital systems.
The FS781/2/4 SSCG
clocks use an IMI proprietary technology to modulate the input clock frequency, FS
OUT
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 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
Page 1 of 13

FS781BT相關型號PDF文件下載

  • 型號
    版本
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    廠商
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  • 英文版
    Low EMI Spectrum Spread Clock
    CYPRESS [C...
  • 英文版
    Low EMI Spectrum Spread Clock
    CYPRESS [C...
  • 英文版
    Low EMI Spectrum Spread Clock
    CYPRESS [C...
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|TSSOP|8PIN|PLASTIC
    ETC
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|TSSOP|8PIN|PLASTIC
    ETC
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|TSSOP|8PIN|PLASTIC
    ETC
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC
    ETC
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC
    ETC
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC
    ETC
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC
    ETC
  • 英文版
    MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC
    ETC
  • 英文版
    Clocks and Buffers
    ETC

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