Texas Instruments ADS126 EVM-PDK Series, User Manual, Page: 20 / 38

1 Input MUX
ADS126xEVM Software
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3.4 Using the ADS126xEVM Plugin
This section describes the controls in the ADS126xEVM plugin. Additional details about specific ADS126x
functions can be found in the ADS1262 and ADS1263 data sheet,
SBAS661 .
3.4.1 Tab 1: Input MUX
The controls on tab 1 select the ADC inputs from the internal multiplexer (mux) and control the PGA
settings. Click the radio buttons to independently select the positive (AINPx) and negative (AINNx) ADC
inputs. Clicking the TEMP, AVDD, DVDD, or TDAC special function inputs selects that function for both
inputs, and configures the PGA as recommended. Note that the
ADC2 radio buttons are only visible when
an ADS1263EVM is connected.
Clicking the AINCOM button enables the VBIAS level shifter. Both the VBIAS level shifter and Chop
functions can be configured on tab 1 and tab 4 ( IDAC \ Sensor Bias ).
To test the ADC noise performance, select the same input signal for AINP and AINN to internally short the
ADC inputs. Remember to set a proper common-mode input voltage by applying an external midsupply
voltage or by using the VBIAS function on AINCOM, as shown in
Figure 17 .
Figure 17. Tab 1 Settings
20 ADS126xEVM-PDK SBAU206 – April 2015
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