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A2814AF-08TT PDF预览

A2814AF-08TT

更新时间: 2022-11-25 21:57:29
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ALSC /
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8页 376K
描述
Low-Power EMI Reduction IC

A2814AF-08TT 数据手册

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October 2003  
rev  
P2811/12/14  
Low-Power EMI Reduction IC  
Features  
Deviation and Spread Option Selections section). These  
combinations include Down Spread, Center Spread and  
percentage deviation range from ±0.625% to -3.50%.  
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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  
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.  
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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  
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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  
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”.  
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The P28xx uses the most efficient and optimized  
modulation profile approved by the FCC and is  
implemented by using a proprietary all-digital method.  
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Applications  
Product Description  
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.  
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  
Block Diagram  
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.  

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