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参数资料
| 型号： | ICS84330AY-03 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 700 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封装： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026BBA, LQFP-32 |
| 文件页数： | 6/21页 |
| 文件大小： | 481K |
| 代理商： | ICS84330AY-03 |
84330AY-03
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 2, 2006
14
Integrated
Circuit
Systems, Inc.
ICS84330-03
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
Spread-spectrum clocking is a frequency modulation tech-
nique for EMI reduction. When spread-spectrum is enabled,
a 32kHz triangle waveform is used from the nominal 333MHz
clock frequency. An example of a triangle frequency modu-
lation profile is shown in Figure 7A below. The ramp profile
can be expressed as:
Fnom = Nominal Clock Frequency in Spread OFF mode
(333MHz with 16.6667MHz IN)
Fm = Nominal Modulation Frequency (32kHz)
δ = Modulation Factor (0.25% down spread)
(1 -
δ) fnom + 2 fm x δ x fnom x t when 0 < t <
,
(1 -
δ) fnom - 2 fm x δ x fnom x t when
< t <
1
2 fm
1
2 fm
1
fm
It is important to note the ICS84330-03 7dB minimum
spectral reduction is the component-specific EMI reduc-
tion, and will not necessarily be the same as the system
EMI reduction.
FIGURE 7B. 333MHZ CLOCK OUTPUT IN FREQUENCY DOMAIN
(A) SPREAD-SPECTRUM OFF
(B) SPREAD-SPECTRUM ON
FIGURE 7A. TRIANGLE FREQUENCY MODULATION
SPREAD SPECTRUM
Δ 10 dBm
Fnom
(1 -
δ) Fnom
0.5/fm
1/fm
BA
δ = 0.25%
ICS84330-03
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
TSD
IDT / ICS 700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
ICS84330-03
14
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PDF描述 |
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| ICS84330BV | 700 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| ICS84330BVLF | 700 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| ICS84330BY | 700 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| ICS84330CM-01LF | 700 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS84330CVI | 720 MHz, OTHER CLOCK GENERATOR, PQCC28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS84330AY-03LF | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84330AY-03LFT | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84330AY-03T | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84330BV | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS84330BVT | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
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