Go to sleep(), the power consumption is same as run in idle(e.g run in while (1) loop). We need goto standby mode, and can be wake up by RTC, can you give us an example, thank you!
This seems to be acceptable. 10Ω and 200pF is your common-mode filter and the cutoff frequency is used to filter out the potential EMI noise.
The differential filter is 20Ω and 50pF, which is trying to filter out the remaining differential noises in EMI. Both filters are not directly related to audio input signals, and the audio input impedance should remain balance up to 20kHz.
