Analog Audio IO Specs

[tunagenes]

@Manysounds

I read somewhere that the noise and THD varied a bit from chip to chip but I can’t for the life of me find that link.

Here’s a post from @shensley that summarizes the history and status of the various ‘codecs’ (combined ADC and DAC) used in different revisions of the Daisy Seed and related products, giving their chip part number and mostly talking about SNR and ‘noise floor’:

Rev5 seed producing ~13dB higher noise floor

To address your question, I feel some Daisy-History is necessary, but the short-version is that the difference in noise floor is related to the codec installed on the board. The original release of Daisy Seed (rev4) had the AK4556 codec installed. The AKM factory that manufactured that codec burned down due to a fire in 2020. Unfortunately, the end result was the part being discontinued, with no plans of continuing to manufacture it. In order to keep Daisy alive despite this, and to be able to…