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參數資料
| 型號： | P2008A-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： | 32 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 172K |
| 代理商： | P2008A-08TT |
July 2005
rev 1.3
P2008A
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 15dB of EMI suppression.
Generates a 1X or X low EMI spread spectrum
clock of the input frequency.
Input frequency range: 4MHz to 32MHz.
Internal loop filter minimizes external components
and board space.
Spreading ranges from ±0.8% to ±3.2%.
SSON# control pin for spread spectrum enable
and disable options.
Low Cycle-to-Cycle jitter.
3.3V Operating Voltage.
Ultra-low power CMOS design.
Available in 8-pin SOIC and TSSOP Packages.
Product Description
The P2008A is a versatile spread spectrum frequency
modulator designed specifically for digital camera and
other digital video and imaging applications. The P2008A
reduces electromagnetic interference (EMI) at the clock
source, allowing system wide reduction of EMI of down
stream clock and data dependent signals. The P2008A
allows significant system cost savings by reducing the
Block Diagram
number of circuit board layers ferrite beads, shielding
and other passive components that are traditionally
required to pass EMI regulations.
The P2008A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The P2008A 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 P2008A is targeted towards cable, xDSL, fax
modem, set-top box, USB controller, DSC, and other
embedded systems.
VSS
VDD
XIN/CLKIN
Divider
Divider
Frequency
Feedback
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
PLL
SSON#
DIV2
SR0
Crystal
Oscillator
XOUT
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