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P2811AF-08SR Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation |
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P2811AF-08SR Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation |
1 / 8 page October 2003 P2811/12/14 rev 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. Low-Power EMI Reduction IC Features FCC approved method of EMI attenuation Provides up to 15 dB EMI reduction Generates 1X, 2X, and 4X low EMI spread spectrum clock of the input frequency 1X: P2811, 2X: P2812, 4X: P2814 Optimized for input frequency range from 10 to 40 MHz P2811: 10 to 40 MHz P2812: 10 to 40 MHz P2814: 10 to 40 MHz Internal loop filter minimizes external components and board space Selectable spread options: Down Spread and Center Spread Low inherent cycle-to-cycle jitter Eight spread % selections: ±0.625% to –3.5% 3.3 V operating voltage CMOS/TTL compatible inputs and outputs Pinout compatible with Cypress CY25811, CY25812, and CY25814 Products available for industrial temperature range Available in 8-pin SOIC and TSSOP Product Description The P28xx is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies from 10 to 40 MHz (see Input/Output Frequency Range Selections). The P28xx can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The P28xx-A and P28xx-B offer various combinations of spread options and percentage deviations (see Output Frequency Deviation and Spread Option Selections section). These combinations include Down Spread, Center Spread and percentage deviation range from ±0.625% to -3.50%. The P28xx reduces electromagnetic interference (EMI) at the clock source, allowing a system wide EMI reduction for all the down stream clocks and data dependent signals. The P28xx 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 P28xx modulates the output of a single 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 most clock generators. Lowering EMI by increasing a signal’s bandwidth is called “spread spectrum clock generation”. The P28xx uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method. Applications The P28xx is targeted towards EMI management for memory interfaces in mobile graphic chipsets and high- speed digital applications such as PC peripheral devices, consumer electronics, and embedded controller systems. Block Diagram |
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