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nRF51422 ADC input resistance and current consumption

Hi. I have a custom board, which I power up via AAA battery through a buck-boost converter. I wan't to measure battery level using on-chip ADC only on requests from master device. What should be the expected current consumption on ADC-off state (leak to ground?) if i hardwire battery+ to ADC input pin? Or while MCU is off? Should I add series resistance there, perhaps?

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