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參數(shù)資料
| 型號： | MPC92429FA |
| 廠商： | MOTOROLA INC |
| 元件分類： | XO, clock |
| 英文描述： | 400 MHz Low Voltage PECL Clock Synthesizer |
| 中文描述： | 400 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 216K |
| 代理商： | MPC92429FA |
MPC92429
TIMING SOLUTIONS
9
MOTOROLA
power supply noise (isolated power and grounds and fully
differentialPLL),therestillmaybeapplicationsinwhichoverall
performance is being degraded due to system power supply
noise.Thepowersupplyfilterandbypass schemesdiscussed
in this section should be adequate to eliminate power supply
noise related problems in most designs.
Figure 6. PCB Board Layout Recommendation for
the PLCC28 Package
C2
1
C
F
Xtal
C1
C1
= V
CC
= GND
= Via
Using the On--Board Crystal Oscillator
The MPC92429 features a fully integrated on--board crystal
oscillator to minimize system implementation costs. The
oscillator is a series resonant, multivibrator type design as
opposed to the more common parallel resonant oscillator
design. The series resonant design provides better stability
and eliminates the need for large on chip capacitors. The
oscillator is totally self contained so that the only external
component required is the crystal. As the oscillator is
somewhatsensitive to loadingon itsinputs theuserisadvised
to mount the crystal as close to the MPC92429 as possible to
avoid any board level parasitics. To facilitate co--location
surface mount crystals are recommended, but not required.
Because the series resonant design is affected by capacitive
loading on the xtal terminals loading variation introduced by
crystals from different vendors could be a potential issue. For
crystals with a higher shunt capacitance it may be required to
place a resistance across the terminals to suppress the third
harmonic. Although typically not required it is a good idea to
layout the PCB with the provision of adding this external
resistor. The resistor value will typically be between 500 and
1K
.
The oscillator circuit is a series resonant circuit and thus for
optimum performance a series resonant crystal should be
used. Unfortunately most crystals are characterized in a
parallel resonant mode. Fortunately there is no physical
difference between a series resonant and a parallel resonant
crystal. The difference is purely in the way the devices are
characterized. As a result a parallel resonant crystal can be
used with the MPC92429 with only a minorerrorin the desired
frequency. A parallel resonant mode crystal used in a series
resonant circuit will exhibit a frequency of oscillation a few
hundred ppm lower than specified, a few hundred ppm
translates to kHz inaccuracies. In a general computer
application this level of inaccuracy is immaterial. Table 11
below specifies the performance requirements of the crystals
to be used with the MPC92429.
Table 11. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance*
Frequency Tolerance
±
75ppm at 25
°
C
Frequency/Temperature Stability
±
150pm 0 to 70
°
C
Operating Range
0 to 70
°
C
Shunt Capacitance
5--7pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
μ
W
Aging
5ppm/Yr (First 3 Years)
* See accompanying text for series versus parallel resonant
discussion.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPC92429FN | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:400 MHz Low Voltage PECL Clock Synthesizer |
| MPC92432 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:1360 MHz Dual Output LVPECL Clock Synthesizer |
| MPC92432AE | 功能描述:時鐘合成器/抖動清除器 FSL 1360MHz Dual Out put LVPECL Clock Syn RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MPC92432AER2 | 功能描述:時鐘合成器/抖動清除器 FSL 1360MHz Dual Out put LVPECL Clock Syn RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MPC92432FA | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:1360 MHz Dual Output LVPECL Clock Synthesizer |
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