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IMIFS787 Dataheets PDF



Part Number IMIFS787
Manufacturers Cypress Semiconductor
Logo Cypress Semiconductor
Description (IMIFS786 / IMIFS787) Low EMI Spectrum Spread Clock
Datasheet IMIFS787 DatasheetIMIFS787 Datasheet (PDF)

www.DataSheet4U.com APPROVED PRODUCT FS786/787 Low EMI Spread Spectrum Clock Features • • • • • • • • • • 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 su.

  IMIFS787   IMIFS787



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www.DataSheet4U.com APPROVED PRODUCT FS786/787 Low EMI Spread Spectrum Clock Features • • • • • • • • • • 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 – typical 5.0 VDC = 115 mW - typical • Available in 8 pin SOIC package. Applications • • • • • • • • • 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 • • • • • 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’s 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. www.DataSheet4U.com Cy.


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