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I1817A-08TT Arkusz danych(PDF) 1 Page - PulseCore Semiconductor |
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1 / 10 page February 2007 P1817A/B rev 1.1 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 Low-Power Mobile VGA EMI Reduction IC Features • FCC approved method of EMI attenuation. • Generates a low EMI spread spectrum clock of the input frequency. • Optimized for frequency range from 60 to 175MHz. • Internal loop filter minimizes external components and board space. • Four selectable spread ranges. • Low inherent cycle-to-cycle jitter. • 3.3V operating voltage range. • TTL or CMOS compatible inputs and outputs. • Ultra-low power CMOS design. • 3.17mA @3.3V, 10MHz | 6.20mA @5.0V, 10MHz • 4.28mA @3.3V, 14MHz | 7.50mA @5.0V, 14MHz • 5.50mA @3.3V, 20MHz | 9.50mA @5.0V, 20MHz • Supports notebook VGA and other LCD timing controller applications. • SSON/SBM pin for Spread Spectrum On/Off and Standby Mode controls. • Available in 8-pin SOIC and TSSOP. Product Description The P1817 is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies. The P1817 reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P1817 allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding and other passive components that are traditionally required to pass EMI regulations. The P1817 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 results 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’. The P1817 uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. Applications The P1817 is targeted towards notebook LCD displays, and other displays using an LVDS interface, PC peripheral devices, and embedded systems. Block Diagram VSS CLKXIN Frequency Divider Feedback Divider Modulation Phase Detector Loop Filter VCO Output Divider ModOUT PLL VDD SSON SR0 REF |
Podobny numer części - I1817A-08TT |
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Podobny opis - I1817A-08TT |
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