ADC reference voltage

[Umesh]

I am new to nrf52. I am unable to find out ADC refernce voltage pin. Can any one help?

[Martin Lesund]

I am not quite sure what you are asking here.

Please read through the documentation linked to in the last post and also read through the SAADC hardware Driver.

I would also invite you to read through this blog post that shows an example how you can use the ADC.