RE: filmscanners: Re: So it's the bits?

[Austin Franklin]

>Because it is an 8-bit D/A, the lowest level we can read is 2^8 lower than
>1024 = 1024/256 = 4mV.

The number of bits has NOTHING to do with what voltage it can read.
Different converters have different voltage ranges, AND the input voltage
range can be changed via an analog front end to the converter.

Typical converters have a voltage range from +3 to -3 volts, or a 6V swing.
An 8 bit converter would therefore have 6/256 or .023V or 23mV resolution
per bit.