The datasheet says that:
Differential mode: 12-bit plus, sign (13 bits)
Single-ended/pseudo differential mode: 11-bit plus, sign (12 bits)
I always get the 12-bit plus, sign (13 bits) in either mode.
Is it right? thanks.
The AD7321 has two types output coding of the conversion result, the twos compliment and straight binary. The default was twos compliment. You can change the coding through bit 5 of the configuration register.
The 13th "bit" in single-ended/pseudo diff mode is just noise, and can be discarded.
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