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]

I2C and adc peripherals are active