Discussion
A 10-bit converter with a 3.3 V reference resolves steps of about
Answer: A
Correct answer: 3.2 mV
\[ \frac{3.3\ \mathrm{V}}{2^{10}} = \frac{3.3}{1024} = 3.22\ \mathrm{mV}. \] That is the size of one least significant bit. It is a theoretical figure: noise, reference stability and the converter’s own linearity mean the effective number of bits is usually a little lower, so a 10-bit reading is rarely good to one count.
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