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无源晶振负载电容值CL匹配方法及说明
2022-08-09 23:31:00 【SimonLiu009】
常见的无源晶振负载电容CL为20PF或12.5PF(后者常见于32.768KHz晶振),如果再考虑电子元件引脚的等效输入电容(含电路板杂散电容Cs在内, Cs一般估值:3~5PF或4~6PF),可尝试:
| CL | CL1/CL2 |
|---|---|
| 20PF | 30PF |
| 18PF | 27PF |
| 15PF | 22PF |
| 12.5PF | 18PF |
| 12PF | 18PF |
| 9PF | 12PF |
| 8PF | 10PF |
| 7PF | 8PF |
以上外接电容匹配参数仅为参考,实际匹配电容值请依据电路板上电后晶振实测输出频率精度为准。
外接电容值大小调整原则
若实测晶振频率偏正向,如晶振12MHz,实测频率为12.000840,尝试往下微调电容值。
若实测晶振频率偏负,如晶振12MHz, 实测频率为11.999060,尝试往上微调电容值。
以下表格来自晶振电路电容的选取一文:
| CL | CL1/CL2 |
|---|---|
| 20pF | 30~33pF |
| 16pF | 22~25pF |
| 12PF | 14~17pF |
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