UG-949
EVAL-AD7761FMCZ User Guide
Rev. 0 | Page 14 of 17
SOFTWARE OPERATION
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16
Figure 16. Evaluation Software Main Window
Overview of the Main Window
The main window contains the significant control buttons and
analysis indicators of the evaluation software.
Configuration Tab and
AD7761
Block Diagram
The
Configuration
tab is the tab displayed by default when the
software first opens. An overview of the
AD7761
block diagram
is shown, along with buttons that open pop-up menus for quick
configuration of the device.
The
Waveform
tab displays captured waveform data. It also
contains options to save the resulting data and shows the output
header data from the conversion results.
The
FFT
and
Histogram
tabs show a more in depth analysis of
the output data. This data can be saved to a file.
Use the
Registers
tab to change the configuration of the
AD7761
.
Sample Button
Click
Sample
to start ADC sampling; results are reported in the
Waveform
,
FFT
, and
Histogram
tabs. Set the mode of
operation using the
Sampling
Mode
drop-down menu; the
mode can be continuous sampling or a single run.
Number of Samples
The number of samples per channel is variable and can be
changed using the
Samples
control.
MCLK
The
MCLK (Hz)
control in the
Configuration
tab must match
the frequency of the ADC clock source.
V
REF
The
Ext. REF (V)
box in the
Configuration
tab control must
match the reference voltage of the ADC.
ADC Reset
Clicking
ADC Reset
in the
Configuration
tab sends a reset
command to the ADC via the SPI, and resets the device to its
default configuration.
Header Data
The
Header Data
area shows the header data output in the first
eight bits of a conversion. It conveys status information and the
channel number. Header data for each channel can be selected
by changing the
Analysis Ch
option.
•
Filter saturated
indicates that filter saturation has occurred.
•
Filter Type
indicates the type of filter that is selected.
•
Filter not settled
indicates that the filter did not settle
before data was sampled.
•
CRC Error
indicates that a cyclic redundancy check error
has occurred, and a reset is required.
Note that the evaluation software is not configured to output
the CRC code.
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Figure 17. Example Header Data
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