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Tyler,
首先,您在G= 1.5 增益的差分放大器配置中使用OPA2340,因此您必须区分差分电压Vin_diff和输入共模电压VCM。 OPA2340输入共模电压范围是超出轨300mV,但不是输出电压–指定输出仅在10k负载下获得任一轨50mV以内。
总之,如果Vsupply=5V且负极轨上的输入共模电压VCM=0,则输入差分电压的有效范围为- 33.3 m (Vout =50mV)到-3.3V (Vout =4.95V)-请参见下文。