Datenblatt-Suchmaschine für elektronische Bauteile |
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I1817A-08SR Datenblatt(PDF) 1 Page - Alliance Semiconductor Corporation |
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I1817A-08SR Datenblatt(HTML) 1 Page - Alliance Semiconductor Corporation |
1 / 10 page October 2003 P1817A/B rev 1.0 Alliance Semiconductor 2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com Notice: The information in this document is subject to change without notice. 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: o P1817A – 20 to 30MHz. Operation o P1817B – 10 to 20MHz Operation Internal loop filter minimizes external components and board space. Two selectable spread ranges. Low inherent cycle-to-cycle jitter. 3.3V or 5V operating voltage range. TTL or CMOS compatible 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 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 VGA chip and other displays using an LVDS interface, PC peripheral devices, and embedded systems. Block Diagram VSS XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Modulation Phase Detector Loop Filter VCO Output Divider ModOUT PLL VDD SSON SR0 Ref |
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