Hi gents,
i'm working on project that requires an Analog microphone to transmit audio to a 32 Ohms speaker.
I'm connecting an electret microphone to the AIN0 input of the ADAU1797 and a speaker to HPOUT.
For now i'm not adding any treatment on the DSP, ADC is directly routed to the DAC, the configuration is done using sigma studio+.
When talking on the microphone i've got a background noise that seems to com from the input ADC stage.
i've tried the following configurations :
- differential mode :
single ended mode, where AIN0+ is ground, i was expecting to be AIN0- but the datasheet says the opposite
I've tried with the EVboard but the result is the same, if someone can assist, i'm afraid of missing an information either on the hardware or on the sigma Studio + configuration.
the noise is the lowest when using the differential hardware configuration and singled ended setup selected on ADC0 settings.
Regards
Bruno