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参数资料
| 型号： | MPC9230ACR2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 750 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封装： | 7 X 7 MM, 1.40 MM HEIGHT, LEAD FREE, MS-026BBA, LQFP-32 |
| 文件页数： | 3/16页 |
| 文件大小： | 375K |
| 代理商： | MPC9230ACR2 |
Advanced Clock Drivers Devices
Freescale Semiconductor
11
MPC9230
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 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 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 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 inaccuracies. In a general, computer
below specifies the performance requirements of the crystals
to be used with the MPC9230.
1
C2
CF
XTAL
C1
= VCC
= GND
= Via
Table 14. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance(1)
1. See 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
5–7 pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
Aging
5 ppm/Yr (First 3 Years)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC9230EI | 功能描述:时钟合成器/抖动清除器 FSL 800MHz 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 |
| MPC9230EIR2 | 功能描述:时钟合成器/抖动清除器 FSL 800MHz 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 |
| MPC9230FA | 功能描述:IC PECL CLOCK LV 800MHZ 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:* |
| MPC9230FN | 功能描述:锁相环 - PLL 3.3V 800MHz 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 |
| 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 |
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