字数:5858.页数:16
摘要 简要介绍高频时钟合成器MC12430的功能、内部结构、引脚排列及典型的应用电路。MC12430 是一个综合效果而合成的时钟源,它的应用电路由晶体振荡器，电源滤波器，MC12430的抖动性能，输出电压摆动对频率的影响构成。MC12430有两种封装形式，28-Lead PLCC与32-Lead LQFP.由于MC12430采用锁相环产生频率，所以合成器的频率由晶体的频率所确定，因而精度很高。 关键字：晶体振荡器，电源滤波器，压控振荡器，相同步逻辑
Abstract The synopsis introduces the function, internal structure that the high frequency of clock
synthesizes the machine MC12430 and leads the feet alignment and applied electric circuit of the
typical models.The MC12430 is a comprehensive result of synthetic clock sources, its applied
electric circuit is included the Crystal Oscillator, the power supply filter, MC12430 function,
output the electric voltage swing to the influence composing of the frequency.The MC12430
have two kinds of seal to pack the form,28- the Lead PLCC with 32- the Lead LQFP.Because the
MC12430 adoption lock mutually the wreath creation frequency, so synthesize the frequency of
the machine from the frequency of the crystal assurance, as a result the accuracy is very
high.Key.
word: Crystal Oscillator，Power Supply Filtering，VCO，PLL
目 录 1.MC12430芯片简介……………………………………………………………4 2．MC12430芯片封装与引脚功能………………………………………………5
3．MC12430芯片内部结构与工作原理…………………………………………7 3．1 晶体振荡器………………………………………………………………8 3．2 接口设计…………………………………………………………………8 3．3 频率合成器……………………………………………………………11 3.4 相位检测器……………………………………………………………..11 3.5分频器……………………………………………………………………11 3.6压控振荡器(VCO)……………………………………………………….11 3.7 计数器…………………………………………………………………11 3.8 锁存器………………………………………………………………….11 3.9 移位寄存器……………………………………………………………11
4．MC12430芯片应用电路的设计………………………………………………11 4．1 电源滤波器的电路设计………………………………………………11 4．1．1 元气件的选择……………………………………………………11 4.1.2 电路设计…………………………………………………………12 4．2 晶体振荡器的设计…………………………………………………12 4.2.1 晶体振荡器的描述……………………………………………12 4.2.2 晶体振荡器的规格……………………………………………13 4．3 接口电路的设计………………………………………………………14 4.3.1 M[8:0]与N[1:0]的设计…………………………………………14 4.3.2 接口测试…………………………………………………………14 4.3.2.1 接口测试框图…………………………………………………14 4.3.2.2 接口测试图表…………………………………………………15
5. 总结…………………………………………………………………………15
6．参考文献……………………………………………………………………16
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