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A successive-approximation converter first compares the sample voltage to the mid-scale voltage.
Then it the compares it to the mid-scale voltage in the upper half of the range (if higher than mid-scale) or the lower half of the range (if lower than mid scale).
This process is repeated up to the resolution of the device.
- Advantage: Conversion time is known and fixed.
- Disadvantage: Hardware implementation is complex.