Analog Devices EVAL-ADAQ4380-4 User Manual page 18

User Guide
ACE SOFTWARE OPERATION
INL AND DNL TAB
The INL and DNL tab displays linearity analysis. INL is the devia-
tion of each individual code from a line drawn from negative full
scale through positive full scale. The point used as negative full
scale occurs ½ LSB before the first code transition. Positive full
scale is defined as a level 1½ LSB beyond the last code transition.
The deviation is measured from the middle of each code to the true
straight line.
In an ideal ADC, code transitions are 1 LSB apart. DNL is the
maximum deviation from this ideal value. DNL is often specified in
terms of resolution for which no missing codes are guaranteed.
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EVAL-ADAQ4380-4/EVAL-ADAQ4370-4/
To perform a linearity test, apply a sinusoidal signal with
0.5 dB above full scale to the EV-ADAQ4380-4FMCZ, EV-
ADAQ4370-4FMCZ, or EV-ADAQ4381-4FMCZ board at INA+ and
INA−, INB+ and INB−, INC+ and INC−, and IND+ and IND− SMB
inputs. Using a large number of averaging iterations results in more
accurate INL and DNL readings but in a significant test time. Click
Run Continuously to perform INL and DNL test.
Figure 25
the ±INL and ±DNL performance of the
averaging iterations.
Figure 25. EVAL-ADAQ4380-4 INL
EVAL-ADAQ4381-4
and Figure 26 show the captured data that includes
ADAQ4380-4 taken at 50
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