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12781AG-08SR Datasheet(PDF) 1 Page - PulseCore Semiconductor |
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12781AG-08SR Datasheet(HTML) 1 Page - PulseCore Semiconductor |
1 / 11 page October 2006 P2781/82/84 rev 1.6 Notice: The information in this document is subject to change without notice. PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018 www.pulsecoresemi.com General Purpose EMI Reduction IC Features • Provides up to 15dB of EMI suppression • FCC approved method of EMI attenuation • Generates a 1X, 2X, and 4X low EMI spread spectrum clock of the input frequency • Input frequency range from 3 to 78MHz • External loop filter for spread % adjustment • Spreading ranges from ±0.25% to ±5.0% • Ultra low cycle-to-cycle jitter • Zero-cycle slip • 3.3V operating voltage range • Ultra-low power CMOS design • P278xA is available in 8 pin SOIC and TSSOP Packages • Available for industrial and automotive temperature ranges. Product Description The P278xA is a versatile spread spectrum frequency modulator designed specifically for digital camera and other digital video and imaging applications. The P278xA reduces electromagnetic interference (EMI) at the clock source, which provides system wide reduction of EMI of all clock dependent signals. The P278xA allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P278xA uses the most efficient and optimized modulation profile approved by the FCC. The P278xA modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock and, more importantly, decreases the peak amplitudes of its harmonics. This result in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal’s bandwidth is called spread spectrum clock generation. Applications The P278xA is targeted towards MFP, xDSL, fax modem, set-top box, USB controller, DSC, and embedded systems. Block Diagram Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Modulation Output Divider VCO XIN /CLKIN XOUT FS0 FS1 LF VDD VSS PLL ModOUT |
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