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P2027AG-08ST 参数 Datasheet PDF下载

P2027AG-08ST图片预览
型号: P2027AG-08ST
PDF下载: 下载PDF文件 查看货源
内容描述: 通用EMI降低IC [General Purpose EMI Reduction IC]
分类和应用: 晶体时钟发生器微控制器和处理器外围集成电路光电二极管
文件页数/大小: 8 页 / 172 K
品牌: PULSECORE [ PulseCore Semiconductor ]
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November 2006
rev 0.2
General Purpose EMI Reduction IC
Features
FCC approved method of EMI attenuation
Provides up to 20 dB of EMI suppression
Generates a low EMI spread spectrum clock of
the input frequency
Optimized for 27 MHz operation
Internal loop filter minimizes external
components and board space
3 selectable spread ranges and 2 modulation
rate options
SSON control pin for spread spectrum enable
and disable options
Low cycle-to-cycle jitter
3.3V operating voltage
16 mA output drives
TTL or CMOS compatible outputs
Low power CMOS design
Supports digital camera and other digital video
and imaging applications
Available in 8 pin SOIC and TSSOP Packages
Product Description
The P2027 is a versatile spread spectrum frequency
modulator designed specifically for digital camera
and other digital video and imaging applications. The
P2027 reduces electromagnetic interference (EMI) at
Block Diagram
MRA SR0 SSON
P2027A
the clock source, which provides system wide
reduction of EMI of all clock dependent signals. The
P2027 allows significant system cost savings by
reducing the number of circuit board layers and
shielding that are traditionally required to pass EMI
regulations.
The P2027 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
The P2027 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 P2027 is targeted towards DSC market as well
as other imaging and digital video applications like
DVD and VCD players.
VDD
PLL
Modulation
XIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop Filter
VCO
Output
Divider
ModOUT
VSS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.