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CDBCAPTURE Datenblatt(PDF) 6 Page - Cirrus Logic

Teilenummer CDBCAPTURE
Bauteilbeschribung  Data Capture and Interface Board for a PC
Download  10 Pages
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Hersteller  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CDBCAPTURE Datenblatt(HTML) 6 Page - Cirrus Logic

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CDBCapture+
6
DS327F1
Figure 6 shows the results of a Histogram Analysis.
This analysis was obtained by grounding the signal
input to the evaluation board and acquiring data.
The results of this analysis are useful in determin-
ing how much noise and offset error is in the sys-
tem and A/D converter. In an ideal system with the
input grounded, all readings should be zero, but due
to noise and offsets, there will be some variation in
the readings. A DC offset will result in the mean
value of the readings being non-zero, and the
MEAN value displayed to the left of the graph is an
indication of the offset, in lsb’s. If the histogram
fits the normal Gaussian distribution, then the Stan-
dard Deviation (STD_DEV) will be a measure of
the RMS noise in the system. The overall peak-to-
peak variation in A/D counts is available by view-
ing the MINIMUM COUNT and MAXIMUM
COUNT values shown to the left of the histogram.
The statistical peak-to-peak noise is defined as the
interval which contains six standard deviations, or
99.6% of all count occurrences, so multiplying the
STD_DEV value to the left of the histogram by six
will yield the peak to peak noise.
Figure 7 shows the analysis screen for a calculation
of a converter’s Differential Nonlinearity (DNL).
To test for DNL, samples are taken using a linear
over-ranged triangle wave for the signal. If a large
number of samples are taken, then the number of
occurrences of each code should be the same if the
converter has perfect differential nonlinearity.
Codes that occur less than average will have a neg-
ative DNL and codes that occur more often than av-
erage will have a DNL greater than zero. The graph
shown in Figure 6 shows the variation in DNL for
each count of the converter. A mouse-controlled
cursor allows the operator to select a particular
code and read out its specific DNL below the
graph. To the left of the graph the maximum and
minimum DNL values for all the codes are dis-
played. If a code has a DNL of -1, then that is a
missing code, it never occurred during the sam-
pling.
Figure 5. Grounded Input FFT


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