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ASM3P2531A-08TT Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation |
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ASM3P2531A-08TT Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation |
1 / 8 page November 2003 ASM3P2531A rev 1.0 Low Frequency EMI Reduction 1 of 8 Notice: The information in this document is subject to change without notice. Features FCC approved method of EMI attenuation. Generates a low EMI spread spectrum of the input clock frequency. Optimized for input frequency range between 35MHz – 55MHz. Internal loop filter minimizes external components and board space. Frequency Deviation: ±1.65%. Low inherent cycle-to-cycle jitter. 3.3 V or 5 V operating voltage. CMOS/TTL compatible inputs and outputs. Ultra low power CMOS design: 5.50 mA @3.3 V. Supports notebook VGA and other LCD timing controller applications. Available in 8-pin SOIC and TSSOP. 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 results 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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