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ASM3P2531A Datasheet Low Frequency Emi Reduction

Manufacturer: Alliance Semiconductor Corporation

Overview: November 2003 rev 1.0 .. ASM3P2531A.

General 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 systemwide reduction of EMI of downstream clock and data 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 STOP VDD Modulation CLKIN Crystal Oscillator PLL Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider MODOUT VSS Low Frequency EMI Reduction Notice: The information in this document is subject to change wi

Key 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.

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ASM3P2531A Distributor