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FS787BZ Datasheet

  • FS787BZ

  • MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC

  • 13頁

  • ETC

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APPROVED PRODUCT
FS786/787
Low EMI Spread Spectrum Clock
Features
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Spread Spectrum Clock Generator (SSCG)
with 1x Spread and 1X non-Spread Output.
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)
Provides Two Output Clocks, One Modulated
and One Non-Modulated clock.
Center Spread Modulation.
3 - 5 Volt power supply.
TTL/CMOS compatible outputs.
Low short term jitter.
Low Power Dissipation;
3.3 VDC = 37 mW 鈥?typical
5.0 VDC = 115 mW - typical
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Available in 8 pin SOIC package.
Applications
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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
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鈥檚 high-speed digital systems.
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 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.
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 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.
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
Document#: 38-07031 Rev. **
05/04/2001
Page 1 of 13

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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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