RE: Can NCS-ADC convert microphone analog signal into digital signal?

Karl Ylvisaker — Tue, 22 Feb 2022 13:39:48 GMT

Hello,

Yes, you may use the SAADC peripheral to generate samples from a microphone and then transfer them elsewhere using the I2S peripheral, sure.
You should configure the SAADC to do periodic sampling at the required frequency through connecting it to a TIMER instance through the PPI peripheral - i.e use the PPI peripheral to make the TIMER CAPTURE/COMPARE event trigger the SAMPLE task of the SAADC, and then have the SAADC's DONE event handler stage the buffer for transfer over I2S.

Best regards,
Karl