Texas Instruments ADS126 EVM-PDK Series, User Manual, Page: 21 / 38

2 Reference
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ADS126xEVM Software
3.4.2 Tab 2: Reference
Figure 18 shows the tab used to configure the ADCx reference source. The voltage reference source is
selected from the ADCx REF Source drop-down menu. When using an external source for ADC1, the
positive and negative reference inputs must be specified by the REFP and REFN drop-down menus.
Selecting the Invert ADC1 REF Inputs checkbox swaps the positive and negative reference inputs, and
allows for fully flexible reference source inputs.
Figure 18. Tab 2 Settings
When using an external reference source for ADC1, also make sure that the ADC1 REF Voltage field is
matched to the applied reference voltage to allow ADCPro to correctly convert the output data from codes
to volts. The internal reference can be disabled when an external referenced is used; however, the internal
reference must be enabled to use the IDACs.
The ADC2 Reference Settings are only visible when an ADS1263EVM is connected.
21 SBAU206 – April 2015 ADS126xEVM-PDK
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