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ASM3X2105AFS Scheda tecnica(PDF) 1 Page - Alliance Semiconductor Corporation |
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ASM3X2105AFS Scheda tecnica(HTML) 1 Page - Alliance Semiconductor Corporation |
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1 / 10 page  October 2003 ASM3X2105A rev 1.0 Alliance Semiconductor 2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com Notice: The information in this document is subject to change without notice. Features FCC approved method of EMI attenuation. Generates a 1X or ½ X low EMI spread spectrum clock of the input frequency. Input frequency range: 6MHz to 10 MHz. Internal loop filter minimizes external components and board space. Frequency deviation: Maximum ± 1%. SSON# control pin for spread spectrum enable and disable options. Low cycle-to-cycle jitter. 5.0V ± 5% operating voltage range. TTL or CMOS compatible outputs. Ultra-low power CMOS design. Available in 8-pin SOIC and TSSOP. Product Description The ASM3X2105A is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies from 6MHz to 12MHz. The ASM3X2105A can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3X2105A offers frequency deviation of ± 1%. The ASM3X2105A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3X2105A 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 ASM3X2105A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The ASM3X2105A modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, and more importantly, decreases 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 frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘spread spectrum clock generation’. Applications The ASM3X2105A is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. Block Diagram VSS XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Modulation Phase Detector Loop Filter VCO Output Divider MODOUT PLL VDD SSON# DIV2 SR0 |
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