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ASM3I2814BF-08TR Datasheet(PDF) 1 Page - PulseCore Semiconductor |
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ASM3I2814BF-08TR Datasheet(HTML) 1 Page - PulseCore Semiconductor |
1 / 11 page ASM3P2811A/B ASM3P2812A/B November 2006 ASM3P2814A/B rev 1.5 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 Power EMI Reduction IC Features • FCC approved method of EMI attenuation. • Provides up to 15dB EMI reduction. • Generates a 1X, 2X and 4X low EMI spread spectrum clock of the input frequency. • 1X: ASM3P2811A/B • 2X: ASM3P2812A/B • 4X: ASM3P2814A/B • Optimized for input frequency range from 10MHz to 40 MHz. • Internal loop filter minimizes external components and board space. • Selectable spread options: Down Spread and Center Spread. • 8 spread frequency deviation selections: • ±0.625% to –3.5% • Low inherent cycle-to-cycle jitter. • 3.3V Operating Voltage. • CMOS/TTL compatible inputs and outputs. • Pin-out compatible with Cypress CY25811, CY25812 and CY25814. • Products are available in Commercial and Industrial temperature range. • Available in 8-pin SOIC and TSSOP Packages. Product Description The ASM3P28XX devices are versatile spread spectrum frequency modulators designed specifically for a wide range of input clock frequencies from 10MHz to 40MHz. (Refer Input/Output Frequency Range Selection Table). The ASM3P28XX can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3P28XX-A and the ASM3P28XX-B offer various combinations of spread options and percentage deviations (Refer Output Frequency Deviation and Spread Option Selection Table). These combinations include Down and Center Spread and percentage deviation range from ±0.625% to –3.50%. The ASM3P28XX reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P28XX 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 ASM3P28XX 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’. The ASM3P28XX uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method. Applications The ASM3P28XX is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and high-speed digital applications such as PC peripheral devices, consumer electronics, and embedded controller systems. |
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