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參數資料
| 型號： | P1819AF-08TT |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | INDUCTOR 10NH 5% FIXED SMD |
| 中文描述： | 40 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | 4.40 MM, ROHS COMPLIANT, TSSOP-8 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 370K |
| 代理商： | P1819AF-08TT |
November 2005
rev 1.7
P1819
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.
Notebook LCD Panel EMI Reduction IC
Features
FCC approved method of EMI attenuation.
Provides up to 15dB EMI reduction.
Generates a low EMI Spread Spectrum clock and a
non-spread reference clock of the input frequency.
Optimized for Frequency range from 20 to 40MHz.
Internal loop filter minimizes external components
and board space.
Selectable spread options: Down and Center.
Low Inherent Cycle-to-Cycle jitter.
Eight spread % selections:
±
0.625% to –3.5%.
3.3V
±
0.3V Operating Voltage range.
Low power CMOS design.
Supports notebook VGA and other LCD timing
controller applications.
Power Down function for mobile application.
Available in Commercial temperature range.
Available in 8-pin SOIC and TSSOP Packages.
Product Description
The P1819 is a Versatile Spread Spectrum Frequency
Modulator designed specifically for input clock frequencies
from 20 to 40MHz. (
Refer Input Frequency and Modulation
Rate
Table).
The
P1819
interference (EMI) at the clock source, allowing system
wide reduction of EMI of down stream clock and data
dependent signals. The P1819 allows significant system
cost savings by reducing the number of circuit board layers
Block Diagram
reduces
electromagnetic
ferrite beads, shielding and other passive components that
are traditionally required to pass EMI regulations.
The P1819 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 P1819 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
Applications
The P1819 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.
VSS
VDD
ModOUT
XIN/CLKIN
Divider
Frequenc
y
Feedback
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
PLL
SRS
D_C/NC PD#
Crystal
Oscillator
XOUT
REF
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相關代理商/技術參數 |
參數描述 |
|---|---|
| P1819AG-08SR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Notebook LCD Panel EMI Reduction IC |
| P1819AG-08ST | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Notebook LCD Panel EMI Reduction IC |
| P1819AG-08TR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Notebook LCD Panel EMI Reduction IC |
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| P1819B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Notebook LCD Panel EMI Reduction IC |
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