如何有效分辨有源晶振和无源贴片晶振?

2025-03-15 14:01:33
推荐回答(1个)
回答1:

有源晶振不需要DSP的内部振荡器,信号质量好,比较稳定,而且连接方式相对简单(主要是做好电源滤波,通常使用一个电容和电感构成的PI型滤波网络,输出端用一个小阻值的电阻过滤信号即可),不需要复杂的配置电路。
最简单的方法就是通过外观看晶振是否为有源晶振。四只贴片脚的即有无源晶振也有有源晶振,区分的方法可以用万用表测,无源晶振的四只贴片脚按对角线的方法测量电阻其中一个对角线是通的且和外壳相通,另一个对角线的电阻是无穷大。而四只贴片脚的有源晶振一般只有小于等于一只贴片脚是和外壳通的,另相同大小的有源晶振一般比无源晶振的重量重一点点,有的厚度也厚一点点。多于四只贴片脚的一般肯定是有源晶振了。

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