Lesson 6 – Executing the DAC Linearity Test
257
The other two methods consider all the measured values and
derive the DeviceLSB from two sorts of linear regression
calculations.
For more information about the calculation of the DeviceLSB, see
the Appendix “Definition of DAC and ADC Characteristics” on
page 567.
DAC Integral Non-Linearity
Integral non-linearity (INL) measures the deviation of each output
value from a calculated straight line.
The straight line can be drawn as a best-fit line or between the end
points as shown below:
Definition of DAC INL
The INL calculation returns 2
n
values, where n is the resolution of
the DAC (the number of bits). A DAC INL test checks the
maximum of these values against a given limit to determine the
pass/fail result.
INL
Digital Input code
Discrete Analog
Output Voltage
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