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Basic Test Procedure
3.3
ADS540x Software Quick Start Guide
Figure 5
introduced the front panel of the ADS540x SPI GUI. This section covers the initial use of the SPI
GUI necessary for most evaluations of the ADS540x.
•
Press the Reset USB Port button if the USB connection has been disrupted since the last use, or if an
error message pops up warning that the USB connection is not valid.
•
Select the Reset position of the reset switch with the mouse. This switch is self-clearing.
•
From this point, select digital functions such as test pattern modes, if desired. All commonly used
register bits listed in the register map of the ADS540x data sheet have a switch on the front panel of
the SPI GUI for easy configuration of the ADS540x.
•
In most applications, use the SPI GUI to enable the HP Mode 1.
•
In most applications, use the SPI GUI to enable the Offset Correction for channel A and Channel B.
•
For the ADS54T0x, use the SPI GUI to set burst length to something large enough that the TSW1400
capture will capture all 12-bit resolution data.
•
Other GUI switches for Bias, Sync, or LP Mode should be left alone, in most cases.
Note that any greyed-out front panel switches are unavailable for use because they have a dependency
upon other switch settings. These functions must first be enabled by selection of a different switch, as
indicated in the ADS540x datasheet.
TSW140x Quick Start Operation
Reference the High Speed Data Converter Pro User's Guide for more detailed explanations of the
TSW1400 or TSW1405 set-up and operation. This document assumes the High Speed Data Converter
Pro software is installed and functioning properly.
Single tone FFT test
•
Select the ADS5402 as the TI ADC Device Selection. If this device does not appear in the device
selection, then the initialization file ADS5402.ini is missing from the ADC Files folder where the High
Speed Data Converter Pro User Interface is installed. Close the GUI, copy the ADS5402.ini file into the
ADC Files folder and relaunch the GUI.
•
Select Single Tone FFT Test
•
Select the number of sample points (and resulting number of FFT bins) to use.
•
Enter the ADC sampling rate.
•
Enter the input frequency desired. If the clock and input frequency signal generators are synchronized,
then make sure the checkbox for coherent frequency is checked and set the input frequency signal
generator to the input frequency displayed.
•
Press the Capture button.
•
Observe an FFT result similar to that of
•
For the ADS54T0x, the TSW1400 may be used to source the trigger to the ADS54T0x EVM by using
the Trigger menu in the High Speed Data Converter Pro GUI as shown in
10
ADS540x and ADS54T0x Evaluation Module (EVM)
Figure
8.
Copyright © 2012, Texas Instruments Incorporated
www.ti.com
Figure
7.
SLAU450 – July 2012
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