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參數(shù)資料
| 型號： | I2779AF-08ST |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 38 MHz, VIDEO CLOCK GENERATOR, PDSO8 |
| 封裝： | 0.150 INCH, LEAD FREE, SOIC-8 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 197K |
| 代理商： | I2779AF-08ST |
June 2005
P2779A
rev 0.1
Low-Cost Notebook EMI Reduction IC
3 of 8
Notice: The information in this document is subject to change without notice.
Spread Spectrum Selection
The P2779A performs zero cycle slip when set at low percentage spreading. This prevents any occurrence of system timing
error. The optimal setting should minimize system EMI to the fullest without affecting system performance. The spreading is
described as a percentage deviation of the center frequency. (Note that the center frequency is the frequency of the external
reference input on XIN/CLKIN, pin 1.)
The P2779A is designed for PC peripheral, networking, notebook PC, and LCD monitor applications. It is optimized for
operation from 20MHz to 38MHz. The P2779A’s spread percentage selection is determined by the external LF value
specified in the Loop Filter Selection Table. The external LF allows the user to fine tune the spread percentage to optimize
the EMI reduction benefits of the spread spectrum.
Application Schematic
PD selection: Power dissipation can be reduced by completely turning off the IC.
1
2
3
4
8
7
6
5
VDD
REF
ModOUT
VSS
LF
PD
XOUT
XIN/CLKIN
P2779A
+3.3V
Modulated 27MHz
27 MHz
C2
C1
R1
0.1F
VDD
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| I2779AF-08-ST | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08TR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08-TR | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08TT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08-TT | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Low-Cost Notebook EMI Reduction IC |
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