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XT2IN、XT2OUT引脚晶振4MHZ，匹配电容为什么选择22pF？请大家指教，谢谢！
考虑晶振周边布线情况；PCB分布电容的影响因素。大约选15~30pF 为宜,以22PF选取最为常见。
请问在哪个资料中有这方面的讲解？
