Texas Instruments ADS1x20EVM, Руководство пользователя, Страница: 6 / 24

Using the ADS1220EVM ADCPro Plug-in
www.ti.com
4 Using the ADS1220EVM ADCPro Plug-in
The ADS1220EVM plug-in for ADCPro provides complete control over all settings of the ADS1220. The
plug-in consists of a tabbed interface (see
Figure 2 ), with different functions available on different tabs.
The tabs are:
• I/O Config
• Current & Ref
• About
The user can adjust the ADS1220EVM settings when not acquiring data. During acquisition, all controls
are disabled and settings may not be changed. When a setting is changed on the ADS1220EVM plug-in,
the setting immediately updates on the board. Settings on the ADS1220EVM correspond to settings
described in the
ADS1220 product data sheet.
4.1 Top-Level Controls
The ADS1220EVM settings can be adjusted when not acquiring data. During acquisition, all controls are
disabled and settings may not be changed.
The effective data rate of the ADS1220 depends upon the frequency of the clock used. The default
operating mode is the internal clock oscillator of the ADS1220, which is 4.096 MHz. The Data Rate
indicator in the upper right corner of the plug-in interface (see
Figure 2 ) is always visible and updates
whenever a setting changes that affects the data rate. The indicated values are representative of the
internal clock frequency of the ADS1220 and the operating clock mode (Normal, Duty-Cycle, or Turbo).
The default operating mode is Normal. The Data Rate is adjusted by making the desired selection from
the drop-down menu.
The Gain indicator in the upper left corner of the plug-in interface (see Figure 2 ) is always visible and
updates whenever a setting changes that affects the gain. The indicated values are representative of the
state of the PGA Bypass. If PGA Bypass is selected on the I/O Config tab (as shown in
Figure 2 ), only
gains of 1, 2, and 4 are bypassed from the PGA. All other gain settings require the PGA to be enabled.
When higher gains are selected, the PGA is enabled regardless of the PGA Bypass state. To limit
confusion regarding the state of the PGA, the only possible selections for PGA Bypass is 1, 2, or 4 from
the drop-down menu.
The only way to view output data results is by operating the ADS1220 in continuous conversion mode.
This mode is identified by the Cont Conv button indicator (as shown in
Figure 2 ) on the bottom left of the
ADS1220EVM plug-in. The button is lit green when in continuous conversion mode, otherwise the
ADS1220 is in single conversion mode in a power-down state. No data can be collected while not in Cont
Conv and are only useful for monitoring supply currents to determine power consumption of the ADS1220
while in power-down.
6 ADS1x20EVM SBAU203 – July 2013
Submit Documentation Feedback
Copyright © 2013, Texas Instruments Incorporated