- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄169479 > C9810AYB PROC SPECIFIC CLOCK GENERATOR, PDSO48 PDF資料下載
參數(shù)資料
| 型號： | C9810AYB |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | SSOP-48 |
| 文件頁數(shù)： | 15/15頁 |
| 文件大小： | 332K |
| 代理商： | C9810AYB |
+/+
…when timing is critical
C9810
Low EMI Clock Generator for Intel
810 Chipset for Mobile Applications
Advanced Information
IMI Confidential
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev 0.4
8/31/1999
MILPITAS, CA 95035, USA TEL: 408-263-6300, FAX 408-263-6571
Page 9 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
(Fig.9A) or around the center (Fig.9B) of its resting frequency by a certain percentage (which also determines the
energy distribution bandwidth). In this device, Spread Spectrum is enabled by setting IC byte0, bit3 = 1. The default of
the device at power up keeps the Spread Spectrum disabled, it is therefore, important to have IC 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 IC byte 5, bits 5, 6 & 7 following tables 4A, and 4B below.
In Down Spread mode the center frequency is shifted down from its rested (non-spread) value by of the total spread
%. (eg.: assuming the center frequency is 100MHz in non-spread mode; when down spread of –0.5% is enabled, the
center frequency shifts to 99.75MHz.).
In Center Spread mode, the Center frequency remains the same as in the non-spread mode.
Down Spread
Center Spread
Fig.9A
Fig.9B
Spread Spectrum Selection Tables
IC BYTE5
Bit[7:5]
Center Frequency
(MHz)
Spread
%
100
66/100/133.3
± 0.25
101
66/100/133.3
± 0.35
110
66/100/133.3
± 0.5
111
66/100/133.3
± 0.7
Table 4A
IC BYTE5
Bit[7:5]
Center Frequency
(MHz)
Spread
%
000
66/100/133.3
- 0.5
001
66/100/133.3
- 0.7
010
66/100/133.3
- 1.0
011
66/100/133.3
- 1.5
Table 4B
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| C9837AT | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| C9853AT | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| C9914BY | 150 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO28 |
| C9PTSJ155.520EL | CRYSTAL OSCILLATOR, CLOCK, 155.52 MHz, LVPECL OUTPUT |
| C9PASH156.250 | CRYSTAL OSCILLATOR, CLOCK, 156.25 MHz, LVPECL OUTPUT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C9811X2AYB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU SYSTEM CLOCK GENERATOR|SSOP|56PIN|PLASTIC |
| C9812 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Low EMI Clock Generator for Intel 810E Chipset Systems |
| C9812DYB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU SYSTEM CLOCK GENERATOR|SSOP|56PIN|PLASTIC |
| C98130-A1231-C30 | 制造商:Siemens 功能描述: |
| C9815DY | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU SYSTEM CLOCK GENERATOR|SSOP|56PIN|PLASTIC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。