 Differential nonlinearity

Differential nonlinearity (acronym DNL) is a term describing the deviation between two analog values corresponding to adjacent input digital values. It is an important specification for measuring error in a digitaltoanalog converter (DAC); the accuracy of a DAC is mainly determined by this specification. Ideally, any two adjacent digital codes correspond to output analog voltages that are exactly one LSB apart. Differential nonlinearity is a measure of the worst case deviation from the ideal 1 LSB step. For example, a DAC with a 1.5 LSB output change for a 1 LSB digital code change exhibits 1⁄2 LSB differential nonlinearity. Differential nonlinearity may be expressed in fractional bits or as a percentage of full scale. A differential nonlinearity greater than 1 LSB may lead to a nonmonotonic transfer function in a DAC. ^{[1]} It is also known as a missing code.
Contents
Formula
DNL = Max(  (V_{out}(i+1)  V_{out}(i))  V_{ideal LSB step}  )
See also
References
 ^ INL and DNL definitions "A DNL error specification of less than or equal to 1LSB guarantees a monotonic transfer function with no missing codes. " http://www.maximic.com/appnotes/index.mvp/id/283
External links
 INL/DNL Measurements for HighSpeed AnalogtoDigital Converters (ADCs) Application Note 283 by Maxim
 Understanding Data Converters
Categories: Digital signal processing
 Electronics stubs
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