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Datasheet 中有说明的：The shutdown (enable) function of the OPA1632 is referenced to the negative supply of the operational amplifier. A valid logic low (< 0.8V above negative supply) applied to the enable pin (pin 7) disables the amplifier output. Voltages applied to pin 7 that are greater than 2V above the negative supply place the amplifier output in an active state, and the device is enabled.
