OPA703

REF2925

+5 V

–5 V

+5 V

10 kΩ

10 kΩ

+2.5V

–2.5 V

Copyright © 2016, Texas Instruments Incorporated

Output Pin

Meter

VOUT

+

–

Sense Line

Force Line

Load

IL

Contact and

Trace Resistance

Copyright © 2016, Texas Instruments Incorporated

13

REF2912, REF2920, REF2925

REF2930, REF2933, REF2940

www.ti.com

SBVS033C – JUNE 2002 – REVISED JUNE 2016

Product Folder Links: REF2912 REF2920 REF2925 REF2930 REF2933 REF2940

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Copyright © 2002–2016, Texas Instruments Incorporated

Feature Description (continued)

Figure 26. Accurate Load Regulation of REF29xx

8.4 Device Functional Modes

8.4.1 Negative Reference Voltage

For applications requiring a negative and positive reference voltage, the OPA703 and REF29xx can be used to

provide a dual-supply reference from a ±5-V supply. Figure 27 shows the REF2925 used to provide a ±2.5-V

supply reference voltage. The low offset voltage and low drift of the OPA703 complement the low drift

performance of the REF29xx to provide an accurate solution for split-supply applications.

Figure 27. REF2925 Combined With OPA703 to Create Positive and Negative Reference Voltages

8.4.2 Data Acquisition

Often data acquisition systems require stable voltage references to maintain necessary accuracy. The REF29xx

family features stability and a wide range of voltages suitable for most micro-controllers and data converters. See

Figure 28 for a basic data acquisition system.