UG-1042 Datasheet, PDF (12/24 Pages) Analog Devices – Fully featured evaluation board for 10-lead precision

UG-1042
Easy to Use AD4000 Series16-/18-Bit Precision SAR ADCs User Guide
AC TESTING—HISTOGRAM
The ac testing histogram tests the ADC for the code distribution
for the ac input, computes the mean and minimum/maximum
amplitude and LSB size of the converter. Raw data is captured
and passed to the PC for statistical computations. To perform a
histogram test, click the Histogram tab and click Sample or
Continuous stream Note that an ac histogram needs a quality
signal source applied to the J6 and J10 input connectors. Figure 22
shows the histogram for a 1 kHz sine wave applied to the ADC
input and illustrates the different measured values for the data
captured.
DC TESTING—HISTOGRAM
More commonly, the histogram is used for dc testing where the
user tests the ADC for the code distribution for dc input, 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, click the Histogram tab and click Start Stream.
Note that a histogram test can be performed without an external
source using a VREF/2 (590 Ω resistor divider) at the ADC input.
To test other dc values, apply a source to the J6 and J10 input
connectors. It may be required to filter the signal to make the dc
source noise compatible with that of the ADC.
Figure 22. Histogram Tab, Histogram Captured for Sine Wave
Rev. B | Page 12 of 24