Using the ADS1220EVM ADCPro Plug-in
4.2
I/O Config Tab
The ADS1220 can acquire data from only one channel at a time. The I/O Config tab (as shown in
) provides control of the MUX selection. MUX selections correspond to settings described in the
product data sheet. The remaining control settings discussed in this document also correspond
to settings described in the product data sheet.
Figure 2. I/O Config
Operating Mode controls the speed of the modulator clock. Depending on the Operating Mode selected
from the drop-down menu, the Data Rate changes appropriately. Normal is the normal operating mode of
the ADS1220, Turbo doubles the Data Rate from Normal, and Duty-Cycle mode reduces the Data Rate
from Normal by four.
FIR Filter settings enable changes to be made to the output response of the digital filter. The default
condition is to have No 50/60 Hz Rejection. Other options from the drop-down menu allow for
Simultaneous 50/60 Hz Rejection, 50 Hz Rejection Only, or 60 Hz Rejection Only.
Four other button options appear on the I/O Config tab. The first button controls the PGA Bypass. When
the PGA Bypass button is active (indicated when lit green), the Gain choice is limited to 1, 2, or 4. The
benefit of using PGA Bypass is removing the common-mode input restriction of the PGA so the full
analog supply range for single-ended measurements can be used. This benefit, however, comes at the
cost of lowered input impedance for the ADS1220.
The Burnout Current Sources button controls the 10-µA burnout current sources. When this button is lit
green, the burnout current is routed through the selected MUX channel and detects any breaks or shorts
to a connected sensor.
7
SBAU203 – July 2013
ADS1x20EVM
Copyright © 2013, Texas Instruments Incorporated