Software Operation - Analog Devices EVAL-AD7761FMCZ User Manual

UG-949

SOFTWARE OPERATION

Overview of the Main Window
The main window contains the significant control buttons and
analysis indicators of the evaluation software.
Configuration Tab and
The Configuration tab is the tab displayed by default when the
software first opens. An overview of the
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.
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Figure 16. Evaluation Software Main Window
AD7761 Block Diagram
AD7761 block diagram
EVAL-AD7761FMCZ User Guide
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