How to sample a microphone with best signal to noise ratio? | Cypress Semiconductor
How to sample a microphone with best signal to noise ratio?
I am trying to preamplify and sample a microphone signal, but I get a lot of noise.
The microphone gives a maximum of about 3mV of signal amplitude. So at the moment I use a single inverting PGA with gain 49 and try to use lowest possible range +/- 256mV of the 16-bit Sigma Delta ADC omitting it's input buffer. The signal to noise ratio of this setup seems to be only about 6 bits.
What is the best method using the internal amplifiers?