2 years, 5 months ago.  This question has been closed. Reason: Unclear question

Sigma Delta ADC - implications?

Hi,

I'm thinking of experimenting with the RS Audio Codec using my LPC1768. It is RS part number 754-1974. It also gets a mention in the cookbook: https://os.mbed.com/cookbook/RS-Audio-Codec.

I've used the LPC1768 internal ADC, and understand how the 12-bit digital value represents an external voltage in the range 0V to 3.3V. This makes it very easy to use. I have used it to capture an audio signal at 20ksps, process it, and send it to a DAC port.

However, the RS Audio Codec uses a Sigma-Delta ADC. What does this mean in a practical sense? Is the data in a different format? If so, how do I convert the Sigma-Delta format into something I can recognise, that will numerically represent the instantaneous voltage on the analogue input pin?

I intend to use it to capture sound, but I intend to process the sound in the LPC1768. That is why I need to understand the Sigma Delta format.

Any help, tips or advice would be really great - thanks.