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| 型号： | MPC9230AC |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY 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, O.80 MM PITCH, MS-026BBA, LQFP-32 |
| 文件页数： | 3/16页 |
| 文件大小： | 795K |
| 代理商： | MPC9230AC |
MPC9230 REVISION 8 MARCH 29, 2010
11
2010 Integrated Device Technology, Inc.
MPC9230 Data Sheet
800MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER
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 application at this level of
inaccuracy is immaterial. Table 14 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 |
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| MPC9230ACR2 | 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 |
| 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 |
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