The sensitivity of the omnidirectional capsule I'm getting is about -42 dB, which is about 8 mV at 1 Pascal. 316 mV RMS meaning 447 mV on average so I assume the VREF that needs to be applied on the INA217 amplifier should also be that value? Then should I disconnect the feedback loop (The one with OPA237, 1MOhm and 0.1uF, suggested by TI) and put a voltage reference circuit in combination with the op-amp as voltage-follower? So the gain for the amplifier should be 20*log(447/8) = ~35dB?
Regarding to the chip itself, I actually cannot find the datasheet for the chip in the same number. According to the vendor, the chip does support USB interfacing, has ADC and DAC supporting either 16/24 bit with sample rate of up to 96 kHz(ADC) and 192 kHz(DAC), but the gain option is never mentioned. I would assume such chip would come with gain settings from 0 to 30 dB, but I doubt it would be as good as building a standalone preamp? Or maybe because they are much more pro and my effort could be just pointless lol. I think I will just build an amp with around 35 dB and just never use the gain setting on the driver then.
For the LDOs, I have always wondered "does providing higher voltage to the IC chips better?" I never dived deep into the internals of these power-related ICs so I'm pretty curious about it. Does giving a higher voltage makes it draw less current to do the same job? or does it make the performance better?
Also, thanks a lot for providing so much help and learning material that I couldn't find on Bing, Bing sux.