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An eight-bit analogue to digital converter with a 5 V reference has a quantisation step of about

  • A.39 mV
  • B.625 mV
  • C.5 mV
  • D.19.5 mV

Answer: D

Eight bits give 256 levels, so the step is \( 5/256 = 0.0195 \) V. The maximum quantisation error is half a step, that is about ten millivolts, which sets a floor on the accuracy however good the rest of the instrument may be.

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