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參數資料
| 型號： | P2681A-08TT |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | General Purpose EMI Reduction IC |
| 中文描述： | 20 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 471K |
| 代理商： | P2681A-08TT |
October 2003
rev D
P2681A
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.
General Purpose EMI Reduction IC
Features
FCC approved method of EMI attenuation
Provides up to 15 dB of EMI suppression
Generates a
1 X
or
X
low EMI spread
spectrum clock of the input frequency
Output frequency from
6MHz
to
20MHz
Digital spread selections
Spreading ranges from +/-0.4% to +/-5.0%
Ultra low cycle-to-cycle jitter
Zero-cycle slip
3.3V and 5.0V operating voltage range
10 mA output drives
TTL or CMOS compatible outputs
Ultra-low power CMOS design
Available in 8 pin SOIC and TSSOP
Product Description
The P2681A is a versatile spread spectrum
frequency modulator designed specifically for digital
camera and other digital video and imaging
applications. The P2681A reduces electromagnetic
interference (EMI) at the clock source, which
provides system wide reduction of EMI of all clock
dependent signals. The P2681A allows significant
Block Diagram
system cost savings by reducing the number of circuit
board layers and shielding that are traditionally
required to pass EMI regulations.
The P2681A uses the most efficient and optimized
modulation profile approved by the FCC.
The P2681A 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”.
Applications
The P2681A is targeted towards MFP, xDSL, fax
modem, set-top box, USB controller, DSC, and
embedded systems.
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