I have published a question at Stack Exchange, Digital Processing [1].
The text is fully copy pasted here:
If this is not the right StackExchange group, please advice.
I seem to have the same problem as 1 (2019, on the miniDSP forum, unanswered) with the NotWired NW-AUD-ICS52000 boards. I have had no other boards with which to test the TDK InvenSense ICS-52000 mics.
The NotWired NW-AUD-ICS52000 board is at 3, and the TDK InvenSense ICS-52000 chip is at 4.
I do hear noise, that's all, all the time. But it differs somewhat in quality. But it's kind of whiteish noise I'd guess.
For me it's a long story, I have fiddled with my own driver in xC, running on XMOS boards, and scoped everything during the development, and found out that it must be the board (99% confident). Using the same SW driver for the PCM5100A on 3, the headset mics do work. I have also tested the headset driver with a sine of 640 Hz and it sure beeps.
I have scope pictures that I can publish. Since I discovered someone else with the same problem my confidence that it's the board rose from 50% to 99%! This is a hobby project so there is nothing I can't disclose.
Even for the 99% I do have some questions that I might make another thread for. Like, is the InvenSense ICS-52000 data sheet 100% correct? Or, is there no contradictions in it?
[1] https://dsp.stackexchange.com/questions/89043/noise-only-from-tdm-input-from-ics-52000-mems-mics-on-board-notwired-nw-aud-ics5
Hello,
My apologies for not replying sooner. I see from reviewing your post on Stack Exchange and also your comments on the MiniDSP forums that switching to our evaluation boards has allowed you to move past your issue.
Unfortunately, I am not familiar with the NotWired board that you were initially asking about, and I wasn't able to find a lot of documentation on the web, but I do hope you're having success with our flex board. While for your purposes, I think the ICS-52000 will do just fine, I did want to mention that it is not recommended for new designs, and we have identified a recommended replacement in the T5848 which should be available in the coming months. This product does not support the full TDM interface that ICS-52000 does, only I2S, but is otherwise an upgrade in performance in many ways, including SNR, THD, and AOP, all at a lower current draw. Given that you mention this is a hobby project, I think the ICS-52000 will suffice but if you are interested in newer products for future projects, I would suggest checking out the T5848 here: https://invensense.tdk.com/products/digital/t5848/.
Feel free to reach out if you have any additional questions.
Regards,
Mike