Texas Instruments ADS1259EVM, Руководство пользователя

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Evaluating Performance with the ADCPro Software
10 Evaluating Performance with the ADCPro Software
The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. (The
ADS1259EVM plug-in is installed as described in the installation section,
Section 9 ).
To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM
menu. To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option
from the corresponding menu.
Only one of each kind of plug-in can be loaded at a time. If you select a different plug-in, the previous
plug-in is unloaded.
10.1 Using the ADS1259EVM-PDK plug-in
The ADS1259EVM-PDK plug-in for ADCPro provides complete control over settings of the ADS1259 and
the PGA280. It consists of a tabbed interface, with different functions available on different tabs. These
controls are described in this section.
You can adjust the ADS1259EVM settings when you are not acquiring data. During acquisition, all
controls are disabled and settings may not be changed.
When you change a setting on the ADS1259EVM plug-in, the setting immediately updates on the board.
Settings on the ADS1259EVM correspond to settings described in the ADS1259 data sheet and the
PGA280 data sheet (available for download at www.ti.com ) for details.
10.1.1 ADC Data Rate
ADCPro can receive data from the ADS1259 at eight different data rates. The data rate is controlled by
the Data Rate control tab (shown in
Figure 30 ) at the upper right portion of the plug-in window. The data
rate default upon start up is 10 samples per second (SPS) with options to change the data rate to 16.67,
50, 60, 400, 1200, 3600, and 14,4400 SPS.
Figure 30. Data Rate Control
10.1.2 ADC Over Range Flag
The ADS1259 has over-range detection for the modulator. If the differential input exceeds 105% of the
range, then the ADC Over Range Flag light indicates the condition, as
Figure 31 illustrates. Note that this
function must be enabled; it is implemented by using the 24th data bit as the over-range indicator. This
indicator is only updated at the end of a data acquisition event by ADCPro. The indicator is located at the
bottom right side of the ADS1259/PGA280 EVM plug-in.
Figure 31. Over-Range Flag
27 SBAU163A – March 2010 – Revised April 2010 ADS1259EVM, ADS1259EVM-PDK
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