如果把Vocm悬空,或者一个电容接地。2个差分输出端口的共模电压是0.8V。可数据手册上是正负电源的中间值。我理解有错吗?
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您好,您理解的不太正确哈.
FIgure 76 是Vocm的内部电路,可以看到,如果将Vocm悬空的话,那么这个引脚分别是通过两个分压电阻60Kohm 接起来的,因此Vocm 电压=1/2[(Vs+)-(Vs-)].
另外,Vocm引脚建议bypss一个电路到地, 减少噪声. 不论Vocm 外部再重新建立共模电压还是悬空,都建议再加一个旁路电阻,去除噪声.