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参数资料
| 型号： | MPC9230FN |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 800 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 9/9页 |
| 文件大小： | 133K |
| 代理商： | MPC9230FN |
4
MPC9230
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
416
PLL), there still may be applications in which overall perfor-
mance is being degraded due to system power supply noise.
The power supply filter and bypass schemes discussed 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
CF
Xtal
C1
= VCC
= GND
= Via
Using the On–Board Crystal Oscillator
The MPC9230 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 somewhat sensitive
to loading on its inputs the user is advised to mount the crystal
as close to the MPC9230 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
MPC9230 with only a minor error in 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 inaccura-
cies. In a general computer application this level of inaccuracy
is immaterial. Table 12 below specifies the performance
requirements of the crystals to be used with the MPC9230.
Table 12. 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
W
Aging
5ppm/Yr (First 3 Years)
* See accompanying text for series versus parallel resonant discus-
sion.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC9230FNR2 | 制造商:Integrated Device Technology Inc 功能描述:PLL Clock Synthesizer Single 28-Pin PLCC T/R 制造商:Integrated Device Technology Inc 功能描述:FSL 800MHz LVPECL Freq. Synthesizer |
| MPC9239 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:900 MHz Low Voltage LVPECL Clock Synthesizer |
| MPC9239AC | 功能描述:时钟合成器/抖动清除器 2.5 3.3V 250MHz Clock Generator RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| MPC9239ACR2 | 功能描述:时钟合成器/抖动清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| MPC9239EI | 功能描述:时钟合成器/抖动清除器 FSL 900MHz LVPECL Freq. Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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