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参数资料
| 型号： | C9832HT |
| 英文描述： | Up to 5A ULDO linear regulator |
| 中文描述： | CPU系统时钟发生器|采用TSSOP | 56PIN |塑料 |
| 文件页数： | 6/24页 |
| 文件大小： | 169K |
| 代理商： | C9832HT |
C9832H
High Performance Pentium 4 Clock Synthesizer
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07109 Rev. **
5/24/2001
Page 6 of 24
Approved Product
Spread Spectrum Clock Generation (SSCG)
Spread Spectrum is a modulation technique used to minimizing Electro-Magnetic Interference (EMI) radiation
generated by repetitive digital signals. A clock presents the greatest EMI energy at the center frequency it is
generating. Spread Spectrum distributes this energy over a specific and controlled frequency bandwidth therefore
causing the average energy at any one point in this band to decrease in value. This technique is achieved by
modulating the clock away from its resting frequency by a certain percentage (which also determines the amount of
EMI reduction). In this device, Spread Spectrum is enabled by setting specific register bits in the SMBus control
Bytes. See applications note AN-0024 for a more in depth description of Spread spectrum modulation and see the
SMBus register section of this data sheet for the exact bit and byte functionally. The following table is a listing of the
modes and percentages of Spread Spectrum modulation that this device incorporates.
SS2
0
0
0
0
1
1
1
1
SS1
0
0
1
1
0
0
1
1
SS0
0
1
0
1
0
1
0
1
Spread Mode
Down
Down
Down
Down
Center
Center
Center
Center
Spread %
+0.00, -0.25
+0.00, -0.50
+0.00, -0.75
+0.00 -1.00
+0.13, -0.13
+0.25, -0.25
+0.37, -0.37
+0.50 -1.50
Note:
See App. Note AN0024.
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