ADS7040EVM-PDK Kit Operation
shows the
Data Capture
page of the EVM GUI. The device SCLK frequency and capture
settings can be configured at the top right hand corner of the
Data Capture
page. Changes made to the
configuration settings are executed on pressing the
Capture
button. The following list describes the
different options available on the
Data Monitor
page.
•
SCLK:
This control sets the clock frequency used by the SPI interface to capture data. By configuring
the SCLK frequency, the sampling rate of the ADS7040 is set. The ADS7040EVM-PDK software
supports SCLK frequencies of 3.2 MHz to 16 MHz. In case the input in this field is beyond the
capability of the device, it will be adjusted to the nearest value that can be supported.
•
Sampling Rate:
The upper limit of the sampling rate (displayed in ksps) is set based on the SCLK
frequency selected. However, sampling rates lower than this displayed value may be set. The GUI
supports these lower rates by increasing the CS high time between frames. Details of the interface
protocol can be studied in the serial interface timing diagrams in the ADS7040 datasheet (
).
In case the input to this field is beyond the capability calculated based on SCLK, it will be constrained
to the maximum sampling rate possible at that SCLK frequency.
•
Sample Count:
This option is used to select the number of contiguous samples captured in a block.
The drop-down menu can be used to select a data block in the range of 1024 samples to 1,048,576
samples per channel. The interface provides a drop-down list for values restricted to 2n, where n is an
integer.
Figure 15. Data Capture Page
Once the ADC data is captured by the GUI using either of the
Capture
buttons, it is displayed on the
graph area on this tab as shown in
. Once plotted, the graph can be zoomed into, panned, or
resized by using the controls at the bottom of the graph area. The data captured may also be transferred
to a file for further analysis by right clicking on the body of the graph and using the various options listed
under
Export
.
13
SBAU240 – November 2014
ADS7040EVM-PDK
Copyright © 2014, Texas Instruments Incorporated
