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ASM3I2531AF-08SR Datasheet(PDF) 1 Page - PulseCore Semiconductor |
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ASM3I2531AF-08SR Datasheet(HTML) 1 Page - PulseCore Semiconductor |
1 / 8 page February 2007 ASM3P2531A rev 1.4 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 Frequency EMI Reduction Features • FCC approved method of EMI attenuation. • Generates a low EMI spread spectrum of the input clock frequency. • Optimized for input frequency range between 27MHz – 55MHz. • Internal loop filter minimizes external components and board space. • Frequency Deviation: ±1.7%. • Low inherent Cycle-to-cycle jitter. • 3.3 V ± 0.3V Operating Voltage. • Ultra low power CMOS design:3.0 mA @ 3.3 V. • Supports notebook VGA and other LCD timing controller applications. • Available in 8-pin SOIC and TSSOP Packages. Product Description The ASM3P2531A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. It reduces electromagnetic interference (EMI) at the clock source allowing system- wide reduction of EMI of downstream clock and data dependent signals. It allows significant system cost savings by reducing the number of circuit board layers and shielding traditionally required to pass EMI regulations. The ASM3P2531A modulates the output of a single PLL in order to spread the bandwidth of a synthesized clock, thereby decreasing 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 clock generators. Lowering EMI by increasing a signal’s bandwidth is called spread spectrum clock generation. The ASM3P2531A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method. Applications The ASM3P2531A is targeted toward the notebook VGA chip and other displays using an LVDS interface, PC peripheral devices, and embedded systems. Block Diagram CLKIN Crystal Oscillator Frequency Divider Feedback Divider Modulation Phase Detector Loop Filter VCO Output Divider ModOUT PLL VDD VSS STOP |
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Similar Description - ASM3I2531AF-08SR |
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