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12781AG-08ST

产品描述78 MHz, OTHER CLOCK GENERATOR, PDSO8
产品类别半导体    嵌入式处理器和控制器   
文件大小177KB,共11页
制造商PulseCore Semiconductor Corporation
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12781AG-08ST概述

78 MHz, OTHER CLOCK GENERATOR, PDSO8

78 MHz, 其他时钟发生器, PDSO8

12781AG-08ST规格参数

参数名称属性值
功能数量1
端子数量8
最大工作温度70 Cel
最小工作温度0.0 Cel
最大供电/工作电压3.6 V
最小供电/工作电压3 V
额定供电电压3.3 V
加工封装描述ROHS COMPLIANT, SOIC-8
无铅Yes
欧盟RoHS规范Yes
状态TRANSFERRED
工艺CMOS
包装形状矩形的
包装尺寸SMALL OUTLINE
表面贴装Yes
端子形式GULL WING
端子间距1.27 mm
端子涂层PURE MATTE 锡/锡 BISMUTH
端子位置
包装材料塑料/环氧树脂
温度等级COMMERCIAL
微处理器类型其他时钟发生器
最大FCLK输出频率78 MHz
额定主时钟晶体频率78 mHz

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October 2006
rev 1.6
General Purpose EMI Reduction IC
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.
P2781/82/84
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.
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
Applications
The P278xA is targeted towards MFP, xDSL, fax modem,
set-top box, USB controller, DSC, and embedded systems.
Block Diagram
FS0
FS1
LF
VDD
PLL
Modulation
XIN /CLKIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
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.
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