full scale (of a unipolar analog-to-digital converter [digital-to-analog converter])

A term used to refer a characteristic to that step within the transfer diagram whose nominal midstep [step] value has the highest absolute value.

NOTE 1 The subscript for the letter symbol of a characteristic at full scale is "FS".

NOTE 2 In place of a letter symbol, the abbreviation "FS" is commonly used.

References: 

JESD99B, 5/07