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參數(shù)資料
| 型號(hào)： | C9853AT |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | TSSOP-48 |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 145K |
| 代理商： | C9853AT |
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+/+
…when timing is critical
C9853
High Performance Pentium
III Clock Generator
Preliminary
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
1.0
4/13/2000
MILPITAS, CA TEL 408-263-6300, FAX 408-263-6571
Page 10 of 16
http://www.imicorp.com
Spectrum Spread Clocking Description
Spread Spectrum is a modulation technique for distributing clock period over a certain bandwidth (called Spread
Bandwidth). This technique allows the distribution of the energy (EMI) over a range of frequencies therefore reducing
the radiation generated from clocks.
As the spread is a percentage of the rested (non-spread) frequency, it is effective
at the fundamental and all its harmonics.
In this device Spread Spectrum is enabled through pin 42 (Spread#). As the name suggests, spread spectrum is
enabled when Spread# is low. This pin has a 250K
internal pull up, therefore, defaults to a high (Spread Spectrum
disabled) unless externally forced to a low.
When Spread# is forced low, the device will be down spread (fig.5B) mode at –0.5%, and the center frequency is shifted
down from its rested (non-spread) value by -0.25%. (ex.: assuming the center frequency is 100MHz in non-spread
mode; when down spread is enabled, the center frequency shifts to 99.75MHz.), see fig.4 below.
Spectrum Analysis
Fig. 4
Spectrum Spreading Selection Table
Unspread
Spread Spectrum Parameter
Frequency in MHz
Down Spreading
F Min
(MHz)
F Center
(MHz)
F Max
(MHz)
Spread
(%)
100.0
99.5
99.75
100.0
- 0.5
133.3
132.3
132.6
133.3
- 0.5
Frequency (MHz)
Amplitude
(dB)
Without Spectrum Spread
With Spectrum Spread
Down Spread
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