1. The input signal is flat at 20KHz. We have tested with 44.1KHz codec sampling frequency and as mentioned by you the attenuation is due to ADC decimation filter. I think the issue should be resolved with 48KHz sampling frequency. We will test with 48KHz sampling frequency and let you know. Thank You.
2. So if I want to use MICDET on both the mic inputs, I have to short it to them. Thus both the mic inputs will be shorted. Will this not cause any problem?
Regards,
Elvin