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I1818D-08ST bảng dữ liệu(PDF) 1 Page - Alliance Semiconductor Corporation

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Giải thích chi tiết về linh kiện  Low Power Mobile VGA EMI Reduction IC
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nhà sản xuất  ALSC [Alliance Semiconductor Corporation]
Trang chủ  https://www.alliancememory.com
Logo ALSC - Alliance Semiconductor Corporation

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Alliance Semiconductor
Production
March 2003
P1818/19/20/21/22
Low Power Mobile VGA EMI Reduction IC
2575 Augustine Drive • Santa Clara, CA 95054 • 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
Provides up to 15 dB EMI reduction
Generates a low EMI spread spectrum clock and a
non-spread reference clock of the input frequency
Optimized for frequency range from 10 MHz to 160
MHz
P1818: 10 to 20 MHz
P1819: 20 to 40 MHz
P1820: 40 to 80 MHz
P1821: 10 to 40 MHz
P1822: 80 to 160 MHz
Internal loop filter minimizes external components
and board space
Selectable spread options: Down Spread and Cen-
ter Spread
Low inherent cycle-to-cycle jitter
Eight spread % selections: +/-0.625% to –3.5%
3.3V operating voltage
CMOS/TTL compatible inputs and outputs
Low power CMOS design
Supports notebook VGA and other LCD timing
controller applications
Power down function for mobile application
Products are available for industrial temperature
range.
Available in 8-pin SOIC and TSSOP
Product Description
The P18xx is a versatile spread spectrum frequency
modulator designed specifically for a wide range of input
clock frequencies from 10 to 160 MHz (see Input Fre-
quency and Modulation Rate Selections). The P18xx
can generate an EMI reduced clock from crystal,
ceramic resonator, or system clock. The P18xx-A to
P18xx-H offer various combinations of spread options
and percentage deviations (see Spread Deviation Selec-
tions). These combinations include Down Spread,
Center Spread and percentage deviation range from
±0.625% to -3.50%.
The P18xx 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 P18xx 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 P18xx 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 P18xx uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all-digital method.
Applications
The P18xx is targeted toward 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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