Daisy Seed - use of MCU and other components

[tunagenes]

The codec varies over time depending on which chip is available (not discontinued). See this post for details:

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…

and this topic seems more current:

Rev 7 noise floor vs Rev 4

I have both of these and the Rev 7 is significantly noisier than the Rev 4. I read that the earlier rev used an AKM codec that isn’t available anymore, but Rev 7 uses the PCM3060, which is supposed to be an improvement over the WM8731 used in Rev 5. I’m measuring 40uVrms noise from Rev 4, and 225uVrms for Rev 7, plugged into a Terrarium with the digital audio out set to 0. That’s 15dB difference and too much for a guitar level input. The WM8731 was claimed in another thread to be 11dB max above…