5

ADS7822

V

CC

CS

D

OUT

DCLOCK

V

REF

+In

–In

GND

+

+

1 F to 10 F

1 F to

10 F

3.3 V

0.1 F

V

IN

V+

V

S

Microcontroller

REF3033

GND

OPA703

REF3025

+5 V

-5 V

+5V

10 kW

10 kW

+2.5 V

-2.5 V

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

www.ti.com

SBVS032G – MARCH 2002 – REVISED NOVEMBER 2015

8.4 Device Functional Modes

8.4.1 Negative Reference Voltage

For applications requiring a negative and positive reference voltage, the OPA703 and REF30xx can be used to

provide a dual supply reference from a ±5-V supply. Figure 26 shows the REF3025 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 REF30xx to provide an accurate solution for split-supply applications.

Figure 26. REF3025 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 REF30xx

family features stability and a wide range of voltages suitable for most microcontrollers and data converters.

Figure 27 and Figure 28 show two basic data acquisition systems.

Figure 27. Basic Data Acquisition System 1

Copyright © 2002–2015, Texas Instruments Incorporated

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Product Folder Links: REF3012 REF3020 REF3025 REF3030 REF3033 REF3040