I got a question from customer.
We have an external 12.288MHz clock that feeds into the PCM1863 at SCKI pin. PCM1863 is controlled via I2C and operates in slave mode with 16KHZ fs, DVDD and IOVDD both at 3.3V, we are wondering what the ADC noise floor or ADC output FFT would be like with 1KHz around -20dBFS or similar input. On top of that, based on the above settings, I believe the ADC oversampling rate is 2.048Mhz/16Khz= 128, is there a way to increase the oversampling rate for this condition to further minimize the noise?
Thank you very much for your help.