EVAL-AD7903SDZ Datasheet, PDF (15/32 Pages) Analog Devices – EVAL-AD7903SDZ User Guide UG-609

EVAL-AD7903SDZ User Guide
OVERVIEW OF THE MAIN WINDOW
The main window of the software is shown in Figure 21 and has
the features described in this section.
File Menu
The File menu offers the choice to
• Load data: load previously captured data.
• Save Data as .tsv: save captured data in .tsv format for
future analysis.
• Save Picture: save the current screen capture.
• Print: print the main window to the default printer.
• Exit: close the application.
Eval Board Connected Box
The Eval Board Connected box displays the evaluation board
connected to the USB port—either EVAL-AD7902SDZ or
EVAL-AD7903SDZ.
When an evaluation board is not connected to the USB port, the
software can be operated in standalone mode for data analysis,
and the part information notes the part number from the saved
data file.
ADC Settings Area
The ADC Settings section allows changing the sampling
frequency and the reference voltage value, as well as selecting
Channel 1 or Channel 2.
Reference Voltage (V) Box
By default, the external reference voltage is 5 V (ADR435 on-board
reference). The minimum/maximum voltage calculations are based
on this reference voltage. If you change the reference voltage, you
must change this input accordingly.
Sampling Freq (Hz) Box
The default sampling frequency (10000000 Hz) in the Sampling
Freq (Hz) box matches the maximum sample rate of the ADC
connected to the board. Although you can adjust the sampling
frequency, there are limitations in terms of the sample frequencies
that can be entered related to the SCLK frequency applied. The
UG-609
sample frequency must be an integer divider of the SCLK
frequency. If an unusable sample frequency is input, the software
automatically adjusts the sample frequency accordingly. Units
can be entered as, for example, 10k for 10,000 Hz. The software
automatically adjusts the sample frequency according to the ability
of the ADC connected to the board. For example, if you enter a
value that is beyond the ability of the device, the software indicates
this and reverts to the maximum sample frequency.
Select Channels Checkboxes
Select either Channel 1 or Channel 2 or both to read the data
from a single ADC or both ADCs simultaneously.
Tabs Area
There are five tabs available in the tabs area of the main window:
Configure, Waveform, Histogram, FFT, and Summary. These
tabs display the data in different formats. Navigation tools are
provided within each tab to allow you to control the cursor,
zooming, and panning (see Figure 22) within the graphs displayed.
Each tab is described in more detail in the Generating a
Waveform Analysis Report; Generating a Histogram of the
ADC Code Distribution; Generating a Fast Fourier Transform
of AC Characteristics; and Generating a Summary of the
Waveform, Histogram, and Fast Fourier Transform sections.
Single Capture Button
Clicking Single Capture performs a single capture from the ADC.
Continuous Capture Button
Clicking Continuous Capture performs a continuous capture
from the ADC.
Num Samples Box
The Num Samples box allows you to select the number of
samples to analyze.
Exit Button
Clicking the Exit button (in the upper right corner of the
window) closes the software. Alternatively, you can select Exit
from the File menu.
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