midstep value (of an analog-to-digital converter)

The analog value for the center of the step excluding the steps at the two ends of the total range of analog input values.

NOTE For the end steps, the midstep value is defined as the analog value that results when the analog value for the transition to the adjacent step is reduced or enlarged, as appropriate, by half the nominal value of the step width.

References: 

JESD99B, 5/07