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我想问；如果这样3.3V的控制端接DA输出时会有影响吗？还是DA输出多少，控制端输入就是多少？
VCA810的电压控制端范围−2 V ≤ Vc ≤ 0 V使得增益从-40dB～40dB范围内。
悬空的话3.3V是不正常的.有做其他动作吗？上电后，测得Vc=3.3V?
没有做其他动作，就是悬空，然后用万能表测对地电压是3.3V
