adc clock in nrf51

[nordicbeginner]

what is minimum clock at which adc can operate in nrf51??. can anyone tell me?? how to change adc clock in nrf51??. i am using sdk11

[FormerMember]

All peripherals use the 16 MHz clock for their operation, including the ADC. The ADC accuracy improves when you use the 16 MHz crystal instead of the RC oscillator.

So there is no clock configuration required for the ADC in nRF51.

[nordicbeginner]

can we use RC oscillator for adc??. because my adc consumes much power

[FormerMember]

The crystal oscillator consumes less power (470 uA) as compared to the RC oscillator (750 uA). If the ADC operation is sporadic with waking up from sleep in low power mode, the time to start the crystal oscillator may offset the power saving.

[Sigurd]

What kind of current consumption are you seeing? What other peripherals are active?

[nordicbeginner]

I2C and adc peripherals are active

[Sigurd]

You don't have any measurements?