ENOB and oversampling ratios for delta-sigma ADCs (in relation to CS5343)
It's nominally a 24-bit 96 kHz ADC, but the datasheet lists a dynamic range of only 98 dB and a &quot;-92 dB THD+N&quot;. The 92 dB figure gives an &quot;effective number of bits&quot; value of 15 using the normal arithmetic. Even the dynamic range would only correspond to 16 bits worth.

Often marketing calls for 24 bit audio, but the customer doesn't know what that means so the vendor cuts corners.

My feeble understanding of the 1-bit datastream that emerges from a delta-sigma would imply to me that if you want to achieve 24-bit resolution, you need to count the number of &quot;1s&quot; that occur in each set of 2^24 samples.

That's a multi-bit converter. It doesn't actually use a binary output from the delta-sigma modulator, but rather has a lesser number of bit DAC which is combined with oversampling and noise shaping to improve SNR.