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參數(shù)資料
| 型號： | P1819H-08TT |
| 元件分類： | XO, clock |
| 英文描述： | 40 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 229K |
| 代理商： | P1819H-08TT |
October 2003
P1819
rev 1.0
Alliance Semiconductor
2575, Augustine Drive
Santa Clara, CA Tel: 408.855.4900 Fax: 408.855.4999 www.alsc.com
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 operating voltage range.
§
TTL or CMOS compatible inputs and outputs.
§
Low power CMOS design.
§
Supports notebook VGA and other LCD timing
controller applications.
§
Power down function for mobile application.
§
Products available for industrial temperature
range.
§
Available in 8-pin SOIC and TSSOP.
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
reduces
electromagnetic
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
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 interfacesin mobile graphic chipsets
and high-speed digital applications such as PC peripheral
devices, consumer electronics, and embedded controller
systems.
Block Diagram
ModOUT
VSS
XIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
PLL
VDD
SRS
D_C PD#
Crystal
Oscillator
XOUT
REF
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相關代理商/技術參數(shù) |
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|---|---|
| P1819XF-08SR | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Notebook LCD Panel EMI Reduction IC |
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| P1819XF-08TR | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Notebook LCD Panel EMI Reduction IC |
| P1819XF-08TT | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Notebook LCD Panel EMI Reduction IC |
| P1819XG-08SR | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Notebook LCD Panel EMI Reduction IC |
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