The voltage reference for this application should have the following features:
For this design, the REF2030 is used. The REF20xx topology is as shown in the Functional Block Diagram section.
The REF2030 is an excellent choice for this application because of its dual output. The temperature drift of
8 ppm/°C and initial accuracy of 0.05% make the errors resulting from the voltage reference minimal in this application. In addition, there is minimal mismatch between the two outputs and both outputs track very well across temperature, as shown in Figure 52 and Figure 53.