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參數(shù)資料
| 型號(hào)： | P2784AG-08TT |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | General Purpose EMI Reduction IC |
| 中文描述： | 312 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | GREEN, TSSOP-8 |
| 文件頁(yè)數(shù)： | 4/11頁(yè) |
| 文件大?。?/td> | 169K |
| 代理商： | P2784AG-08TT |
July 2005
rev 1.5
P2781/82/84
General Purpose EMI Reduction IC
4 of 11
Notice: The information in this document is subject to change without notice.
Spread Spectrum Selection
The P278xA performs Zero Cycle Slip when set at low percentage spreading. This allows no 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: the center frequency is the frequency of the external reference input on CLKIN, Pin 1.)
The P2781A is designed for PC peripheral, networking, notebook PC, and LCD monitor applications. It is optimized for
operation between 3 to 78MHz range. In the following application schematic example, the P2781A spread percentage
selection is determined by the external LF value specified in the Loop Filter Selection Table. The Input Frequency Selection
Table specifies the input frequency range. The external LF allows the user to fine tune the spread percentage to optimize the
EMI reduction benefits of the spread spectrum.
Note: Both logic input pins FS1 and FS0 have to be connected to either VDD or VSS. Do not leave them floating.
1
2
3
4
8
7
6
5
VDD
FS0
ModOUT
VSS
LF
FS1
XOUT
XIN/CLKIN
P2781A
+3.3V
Modulated 16MHz Clock
To target Chip
16 MHz
0.1μF
C2
C1
R1
0 Ohm
2.2 K
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