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从手册第9页看,你需要用其他的芯片做分频,2531内部的R divider最高只能接受80MHz的输入时钟。分出来的基准时方波问题不大,因为即使一个正弦波进2531,内部的buffer也会把它整形成方波的。需要注意的是
1. 手册第6页电路图中标明的100nF交流耦合。
2. 手册第9页指出VOSCin的范围是0.5~2Vpp。