UG-490 Datasheet, PDF (13/28 Pages) Analog Devices – Full-featured evaluation board

Evaluation Board User Guide
DC TESTING—HISTOGRAM
The histogram is most often used for dc testing where a user
tests the ADC for the code distribution for dc 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,
1. Select the Histogram tab.
2. Click Single Capture or Continuous Capture.
Note that a histogram test can be performed without an
external source since the evaluation board has a buffered VREF/2
source at the ADC input.
To test other dc values, apply a source to the J1/J2 inputs. You
may be required to filter the signal to make the dc source noise
compatible with that of the ADC.
EVAL-AD7960FMCZ
AC TESTING—HISTOGRAM
Figure 21 shows the 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,
1. Select the Histogram tab.
2. Click Single Capture or Continuous Capture.
Note that an ac histogram needs a quality signal source applied
to the input J1/J2 connectors.
Figure 21 shows the histogram for a 1 kHz sine wave applied to
the ADC input and the results calculated.
The Histogram Analysis (Label 1) illustrates the various
measured values for the data captured.
1
Figure 21. Histogram Capture Tab
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