IC695ALG106 貼片晶振是什么？
常說的晶振，是石英晶體元器件中的一種。石英晶體諧振器、石英晶體振蕩器、石英晶體濾波器均為石英晶體元器件。石英晶體是一種壓電晶體。壓電晶體當受特定方向擠壓或拉伸時，它的兩端就會產生不同的電荷。根據效應情況不同，分為正壓電效應與逆壓電效應。貼片晶振主要是用于電路中的時鐘模塊，來提供相應的時鐘基準，常見的應用主要是嵌入式設計，如FPGA、DSP等開發板中。
二、無源晶振和有源晶振腳位異同？
1）二腳位的貼片晶振是無源晶振。
2）四腳位的貼片晶振可能是無源晶振，也可能是有源晶振 。
3）四腳位以上的貼片晶振一定是有源晶振。
4）有源晶振本身印字有左下腳有個點。
三、如何區分貼片晶振腳位方向？
無源晶振是無極性器件，沒有方向，無源晶振在四腳的情況下，只有兩個腳是功能腳，另外兩腳懸空，用于接GND；對于有源晶振而言，一般情況下有源晶振印字上面會標注腳位方向，即在左下角一個點。常見的4腳貼片晶振封裝有1.6*1.2mm，2.0*1.6mm，2.5*2.0mm，3.2*2.5mm，3.0*1.5mm，5.0*3.2mm，7.0*5.0mm等等。有源晶振的包裝通常為金屬面，如下：YSX321SL無源晶振與YSO321SR有源晶振的腳位圖。
YSO321SR有源晶振腳位圖
YSX321SL無源晶振腳位圖
IC695ALG106
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IC695ALG106
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