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參數資料
| 型號： | X2781AG-08ST |
| 元件分類： | XO, clock |
| 英文描述： | 78 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | GREEN, SOIC-8 |
| 文件頁數： | 1/11頁 |
| 文件大?。?/td> | 384K |
| 代理商： | X2781AG-08ST |
P2781/82/84
General Purpose EMI
Reduction IC
2010 SCILLC. All rights reserved.
Publication Order Number:
JANUARY 2010 – Rev. 2
P2781/D
Features
Provides up to 15dB of EMI suppression
FCC approved method of EMI attenuation
Generates a 1X, 2X, and 4X low EMI spread spectrum
clock of the input frequency
Input frequency range from 3 to 78MHz
External loop filter for spread % adjustment
Spreading ranges from ±0.25% to ±5.0%
Ultra low cycle-to-cycle jitter
Zero-cycle slip
3.3V operating voltage range
Ultra-low power CMOS design
P278xA is available in 8-pin SOIC and TSSOP
Packages
Available for industrial and automotive
temperature ranges.
Product Description
The P278xA is a versatile spread spectrum frequency
modulator designed specifically for digital camera and other
digital video and imaging applications. The P278xA
reduces electromagnetic interference (EMI) at the clock
source, which provides system wide reduction of EMI of all
clock dependent signals. The P278xA allows significant
system cost savings by reducing the number of circuit
board layers and shielding that are traditionally required to
pass EMI regulations.
The P278xA uses the most efficient and optimized
modulation profile approved by the FCC. The P278xA
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 result 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.
Applications
The P278xA is targeted towards MFP, xDSL, fax modem,
set-top box, USB controller, DSC, and embedded systems.
Block Diagram
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
Modulation
Output
Divider
VCO
XIN / CLKIN
XOUT
FS0
FS1
LF
VDD
VSS
PLL
ModOUT
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相關代理商/技術參數 |
參數描述 |
|---|---|
| X2781AG-08TR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:General Purpose EMI Reduction IC |
| X2781AG-08TT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:General Purpose EMI Reduction IC |
| X2782A-08SR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:General Purpose EMI Reduction IC |
| X2782A-08ST | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:General Purpose EMI Reduction IC |
| X2782A-08TR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:General Purpose EMI Reduction IC |
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