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ASM3P2814A

Alliance Semiconductor Corporation
Part Number ASM3P2814A
Manufacturer Alliance Semiconductor Corporation
Description (ASM3P281xA/B) Low Power EMI Reduction IC
Published Mar 3, 2009
Detailed Description September 2003 ASM3P2811A/B ASM3P2812A/B ASM3P2814A/B rev 1.0 www.DataSheet4U.com Low Power EMI Reduction IC Features...
Datasheet PDF File ASM3P2814A PDF File

ASM3P2814A
ASM3P2814A

Overview
September 2003 ASM3P2811A/B ASM3P2812A/B ASM3P2814A/B rev 1.
0 www.
DataSheet4U.
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.
o o o to 40 MHz.
o o o ASM3P2811A/B: 10 to 40MHz ASM3P2812A/B: 10 to 40MHz ASM3P2814A/B: 10 to 40MHz 1X: ASM3P2811A/B 2X: ASM3P2812A/B 4X: ASM3P2814A/B 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.
Optimized for input frequency range from 10MHz Internal loop filter minimizes external components and board space.
Selectable spread options: Down Spread and Center Spread.
8 spread frequency deviation selections: o ±0.
625% to –3.
5% Low inherent cycle-to-cycle jitter.
3.
3V operating voltage range.
CMOS/TTL compatible inputs and outputs.
Pinout compatible with Cypress CY25811, CY25812 and CY25814.
Products are available for industrial temperature range.
Available in 8-pin SOIC and TSSOP.
Applications The ASM3P28XX is targeted towards EMI management for memory and LVDS interfaces...


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