ADSxx54EVM-PDK Kit Operation
6.7
Histogram Analysis
Histogram testing is commonly used when characterizing ADCs. A histogram is merely a count of the
number of times a code has occurred in a particular data set. The
Histogram Analysis
page of the GUI
creates a histogram of the data of the acquired data set and displays it.
shows the
Histogram
Analysis
page of the GUI.
Figure 24. Histogram Analysis Page
The
DC Analysis
table shown in
displays several parameters of the captured data set:
•
The
StDev
column displays the standard deviation of the data set. This value is equivalent to the RMS
noise of the signal when analyzing a dc data set.
•
The
Codes(pp)
column shows the peak-to-peak spread of the codes in the data set; for a dc data set,
this range would be the peak-to-peak noise.
•
The
Mean
column displays the average value of the data set.
•
The
ENOB(StDev)
column displays the effective number of bits of the converter, as calculated from the
standard deviation or RMS noise.
•
The
Noise Free Bits
column displays the effective bits of the converter when calculated using the peak-
to-peak noise.
6.8
Troubleshooting
If the ADSxx54EVM software stops responding while the ADSxx54EVM-PDK is connected, unplug the
USB cable from the EVM, unload the ADSxx54EVM-PDK software, reconnect the ADSxx54EVM-PDK to
the PC, and reload the ADSxx54EVM software.
When initially setting up the EVM, the software detects the EVM hardware, and loads the appropriate
hardware settings. If the EVM hardware is not detected, the GUI defaults to the
Capture Mode: Software
Debug
mode of operation using a preloaded captured data file for demonstration purposes.
23
SBAU209 – April 2014
ADS8354EVM-PDK and ADS7854EVM-PDK
Copyright © 2014, Texas Instruments Incorporated