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| 型号： | IMIC9806AYB |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | SSOP-48 |
| 文件页数： | 13/15页 |
| 文件大小： | 178K |
| 代理商： | IMIC9806AYB |
C9806
I
2C Frequency Clock Generator for Mobil Pentium II Applications.
Approved Product
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.4
9/2/1999
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 7 of 15
http://www.imicorp.com
Spread Spectrum Clock Generation
(SSCG)
Spread Spectrum is a modulation technique applied here for maximum efficiency in minimizing Electro-Magnetic
Interference radiation generated from repetitive digital signals mainly clocks. A clock accumulates EM energy at the
center frequency it is generating. Spread Spectrum distributes this energy over a small frequency bandwidth therefore
spreading the same amount of energy over a spectrum. This technique is achieved by modulating the clock down from
or around the center of its resting frequency by a certain percentage (which also determines the energy distribution
bandwidth). In this device, Spread Spectrum is enabled by setting I2C byte0, bit1 = 1, and bit0 = 0. The default of the
device at power up keeps the Spread Spectrum disabled, it is therefore, important to have I2C accessibility to turn-on the
Spread Spectrum function. Once the Spread Spectrum is enabled, the spread bandwidth option is selected by SST (0:2)
in I2C byte 0, bits 4, 5 & 6 following table 5 below.
Down Spread
Center Spread
Spread Spectrum Bandwidth Selection Table.
SST2
SST1
SST0
Bandwidth
Direction
0
+/- 0.625%
Center
0
1
+/- 0.5%
Center
0
1
0
+/-0.35%
Center
0
1
+/-0.25%
Center
1
0
-2.5%
Down
10
1
-1%
Down
1
0
- 0.7%
Down
1
- 0.5%
Down (default)
Table 5.
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| IMIC9806JBT | 制造商:Cypress Semiconductor 功能描述:Development Tools, Notebook, Intel Piii /Celeron 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| IMIC9827H | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Clocks and Buffers |
| IMIC9827JT | 制造商:Rochester Electronics LLC 功能描述:TIMING DEVICE - Tape and Reel |
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