Can I use the ADAU1701 as a balance mic input using ADC1 and ADC0 to receive a balanced output ?
yes, you can use a dedicated mic preamp for this task:
This part requires a voltage rail of at least 10 V; +/-5 V or greater. If you do not have that available, your best option would be to create one from a single op amp, in a differential input style circuit.
The ADAU1701 ADC inputs are single-ended and have a sensitivity of 100 uA rms; this translates to 2 V RMS when an 18 k ohm external resistor is placed before the ADC. This value can be changed to 9 k ohms for 1 V RMS sensitivity.I would not recommend using lower value resistors to increase the sensitivity; noise performance will suffer if you very from these optimized values.
Depending on the type of microphone you are using, you might need a significant amount of gain between the mic and the ADAU1701 ADC input. Can you provide some information about the microphone output level under the expected operating conditions?
With regards to your question about connecting a balanced microphone output, I would need to know more about the microphone circuit.
Thanks, I guess I cam put a balance mic amp in front of the ADC1 and ADC0 to receive a balanced output ?
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