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參數(shù)資料
| 型號： | I1817BF-08TR |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Low-Power Mobile VGA EMI Reduction IC |
| 中文描述： | 20 MHz, VIDEO CLOCK GENERATOR, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 302K |
| 代理商： | I1817BF-08TR |
October 2003
rev 1.0
P1817A/B
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 Mobile VGA EMI Reduction IC
Features
FCC approved method of EMI attenuation.
Generates a low EMI spread spectrum clock of the
input frequency.
Optimized for frequency range from:
o
P1817A – 20 to 30MHz. Operation
o
P1817B – 10 to 20MHz Operation
Internal loop filter minimizes external components
and board space.
Two selectable spread ranges.
Low inherent cycle-to-cycle jitter.
3.3V or 5V operating voltage range.
TTL or CMOS compatible outputs.
Ultra-low power CMOS design.
3.17mA @3.3V, 10MHz | 6.20mA@5.0V, 10MHz
4.28mA @3.3V, 14MHz | 7.50mA @5.0V, 14MHz
5.50mA @3.3V, 20MHz | 9.50mA @5.0V, 20MHz
Supports notebook VGA and other LCD timing
controller applications.
SSON pin for Spread Spectrum On/Off and
Standby Mode controls.
Available in 8-pin SOIC and TSSOP.
Product Description
The P1817 is a versatile spread spectrum frequency
modulator designed specifically for input clock frequencies.
The P1817 reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of
Block Diagram
down stream clock and data dependent signals. The P1817
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 P1817 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 P1817 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
Applications
The P1817 is targeted towards notebook VGA chip and
other displays using an LVDS interface, PC peripheral
devices, and embedded systems.
VSS
XIN
XOUT
Crystal
Oscillator
Divider
Divider
Frequency
Feedback
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
PLL
VDD
SSON
SR0
Ref
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| I1818A-08SR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low Power Mobile VGA EMI Reduction IC |
| I1818A-08ST | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low Power Mobile VGA EMI Reduction IC |
| I1818A-08TR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low Power Mobile VGA EMI Reduction IC |
| I1818A-08TT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low Power Mobile VGA EMI Reduction IC |
| I1818B-08SR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low Power Mobile VGA EMI Reduction IC |
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