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Measuring Vbat (2xAAA cell) with nRF52

Hello, I tryed to find in Q&A something that can help me understand how it is possible to measure battery voltage with nRF52, but i am not sure i found the exact explanations. I am using primary 2xAAA cell (meaning 3v when fresh and it is going low until ~ 1.6v , although we will probably stop system operation below 2v). I would like to perform as accurate measurements as possible with A/D of nRF52. Do i need to add additional hardware? Basically, usually A/D demands low impedance input to operate properly and some capacitor is recommended at its input. If i had higher voltage, i would probably add some resistor devider network with some N-MOS in order to save energy and have the lowest current consumption possible, but what about the case where the power voltage is the same as Vcc of the chip?

thank you for your help. BR, Yulya

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