Ac Testing-Data Capture/Histogram Tab; Dc Testing-Data Capture/Histogram Tab - Analog Devices EVAL-AD7492SDZ User Manual

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AC TESTING—DATA CAPTURE/HISTOGRAM TAB
Figure 18 shows the Data Capture/Histogram tab. This tests
the ADC for the code distribution for ac input and computes
the mean and standard deviation, or transition noise of the
converter, and displays the results. Raw data is captured and
passed to the PC for statistical computations. To perform a
histogram test, select Histogram from the test selection window
and click Sample. An ac histogram needs a quality signal source
applied to the input of the SK1 and SK3 connectors. Figure 18
shows the histogram for a 10 kHz sine wave applied to the ADC
input, and the results calculated.
Number 1 in Figure 18 shows the different measured values for
the data captured.
1
Figure 18. Data Capture/Histogram Tab
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EVAL-AD7492SDZ User Guide
DC TESTING—DATA CAPTURE/HISTOGRAM TAB
More commonly, the Data Capture/Histogram tab is used for
dc testing. This is where user can test the ADC for the code
distribution for dc input and compute the mean and standard
deviation, or transition noise of the converter, and display the
results. Raw data is captured and passed to the PC for statistical
computations. To perform a histogram test, select Histogram from
the test selection window and click Sample. A histogram test can
be performed without an external source because the evaluation
board has a buffered V /2 source at the ADC input. To test other
REF
dc values, apply a source to the SK1 and SK3 inputs. It may be
required to filter the signal to make the dc source noise compatible
with that of the ADC.