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MSP430F149: 如果ADC启用内部2.5v基准,消耗的电流是15毫安,如果是外部基准2.5v消耗的电流只有5毫安

Part Number: MSP430F149

我用MSP430F149单片机做模数转换,3.3v供电,如果ADC启用内部2.5v基准,消耗的电流是15毫安,如果是外部基准2.5v消耗的电流只有5毫安,为什么会有这么大差距