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PCM1807 uses 23 bit signed, but why?

Anthony Rolando
Prodigy 90 points
Other Parts Discussed in Thread: PCM1807

The PCM1807 does not accept negative voltages, it operates from 0V to 3.3V so then why does it output 23 bit signed? Is there a comparable TI ADC part that outputs 24 bit un-signed?

 

Thank you,

 

Tony Rolando