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ASM3P2853A Datasheet Peak Emi Reducing Solution

Manufacturer: Alliance Semiconductor Corporation

Overview: December 2004 .. ASM3P2853A Peak EMI Reducing Solution rev 0.

General Description

The ASM3P2853A is a versatile spread spectrum frequency modulator.

The ASM3P2853A reduces electromagnetic interference (EMI) at the clock source.

The ASM3P2853A allows significant system cost savings by reducing the number of circuit board layers and Block Diagram VDD PWDNB XIN XOUT Crystal Oscillator PLL1 USB Clock (48 MHz Unmodulated) 50 MHz Modulated SSONB PLL2 VSS Alliance Semiconductor 2575 Augustine Drive • Santa Clara CA • Tel: 408-855-4900 • Fax: 408-855-4999 • .alsc.

Key Features

  • Generates an EMI optimized clock signal at output. Input frequency: 25 MHz. Frequency outputs: o o USB Clock (48 MHz unmodulated) 50 MHz (modulated), ±1% centre spread shielding that are required to pass EMI regulations. The ASM3P2853A modulates the output of 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 mos.

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