Determine the audio sampling rate fS if DFSDM clock is 80 MHz, DFSDM clock divider value is 57, and the oversampling ratio is 64:
The formula for calculating the audio sampling rate is:
fS = (fCLKOUT)/(OSR x (DFSDMCLK_DIV + 1))
where,
fCLKOUT = DFSDM clock frequency = 80 MHz
OSR = oversampling ratio = 64
DFSDMCLK_DIV = DFSDM clock divider value = 57
Plugging the given values in the above formula, we get:
fS = (80 MHz)/(64 x (57 + 1))
fS = 88.235 kHz (approx.)
Therefore, the audio sampling rate is 88.235 kHz.