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参数资料
| 型号： | MPC9229DT |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 400 MHz, OTHER CLOCK GENERATOR, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 9/9页 |
| 文件大小： | 152K |
| 代理商： | MPC9229DT |
MPC9229
388
FREESCALE SEMICONDUCTOR ADVANCED CLOCK DRIVERS DEVICE DATA
PLL), there still may be applications in which overall
performance 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
Using the On-Board Crystal Oscillator
The MPC9229 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 MPC9229 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 1 K
.
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
MPC9229 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
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
MPC9229.
1
C2
CF
XTAL
C1
R1 = 10–15
C1 = 0.01
F
C2 = 22
F
C3 = 0.01
F
= VCC
= GND
= Via
Table 11. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance1
1.
Refer to the accompanying text for series versus parallel resonant
discussion.
Frequency Tolerance
±75 ppm at 25°C
Frequency/Temperature Stability
±150 pm 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
5 ppm/Yr (First 3 Years)
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相关代理商/技术参数 |
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| MPC9229EI | 功能描述:时钟合成器/抖动清除器 FSL 400MHz 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 |
| MPC9229EIR2 | 功能描述:时钟合成器/抖动清除器 FSL 400MHz 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 |
| MPC9229FA | 功能描述:IC PECL CLOCK LV 400MHZ 32-LQFP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| MPC9229FAR2 | 制造商:Integrated Device Technology Inc 功能描述:PLL Clock Synthesizer Single 32-Pin TQFP T/R |
| MPC9229FN | 功能描述:锁相环 - PLL 3.3V 400MHz Clock Generator RoHS:否 制造商:Silicon Labs 类型:PLL Clock Multiplier 电路数量:1 最大输入频率:710 MHz 最小输入频率:0.002 MHz 输出频率范围:0.002 MHz to 808 MHz 电源电压-最大:3.63 V 电源电压-最小:1.71 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:QFN-36 封装:Tray |
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