Datenblatt-Suchmaschine für elektronische Bauteile |
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CDBCAPTURE Datenblatt(PDF) 6 Page - Cirrus Logic |
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CDBCAPTURE Datenblatt(HTML) 6 Page - Cirrus Logic |
6 / 10 page 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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