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ASM3P1819NF-08-ST Datasheet(PDF) 1 Page - PulseCore Semiconductor |
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ASM3P1819NF-08-ST Datasheet(HTML) 1 Page - PulseCore Semiconductor |
1 / 7 page February 2007 ASM3P1819N rev 0.3 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 • Provides up to 15dB EMI reduction • Generates a low EMI spread spectrum clock and a non-spread Reference Clock of the input frequency • Optimized for frequency range from 20MHz to 40MHz • Internal loop filter minimizes external components and board space • Down Spread Deviation: -1.25% • Low inherent Cycle-to-Cycle jitter • 3.3V Operating Voltage • CMOS/TTL compatible inputs and outputs • Low power CMOS design • Supports notebook VGA and other LCD timing controller applications • Power Down function for mobile application • Products are available for industrial temperature range. • Available in 8 pin SOIC and TSSOP Packages Functional Description The ASM3P1819N is a versatile spread spectrum frequency modulator designed specifically for a wide range of input clock frequencies from 20 to 40MHz. The ASM3P1819N can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3P1819N reduces electromagnetic interference (EMI) at the clock source, allowing a system wide EMI reduction for all the down stream clocks and data dependent signals. The ASM3P1819N 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 ASM3P1819N modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, thereby decreasing the peak amplitude of its harmonics. This result in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most clock generators. Lowering EMI by increasing a signal’s bandwidth is called “spread spectrum clock generation”. The ASM3P1819N uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method Applications The ASM3P1819N is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and high-speed digital applications such as PC peripheral devices, consumer electronics and embedded controller system. Block Diagram VDD PD# VSS ModOUT XIN Frequency Divider Feedback Divider Modulation Phase Detector Loop Filter VCO Output Divider PLL Crystal Oscillator XOUT REF |
Similar Part No. - ASM3P1819NF-08-ST |
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