ADS7822

V

CC

CS

D

OUT

DCLOCK

V

REF

+In

-In

GND

+

+

5W

1 F to 10 F

m

m

1 F to

m

10 F

m

3.3V

0.1 F

m

V

IN

V+

V

S

Microcontroller

REF3133

GND

OPA703

REF3125

+5V

-5V

+5V

10kW

10kW

+2.5V

-2.5V

13

REF3112, REF3120, REF3125

REF3130, REF3133, REF3140

www.ti.com

SBVS046D – DECEMBER 2003 – REVISED MARCH 2016

Product Folder Links: REF3112 REF3120 REF3125 REF3130 REF3133 REF3140

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Copyright © 2003–2016, Texas Instruments Incorporated

8.4 Device Functional Modes

8.4.1 Negative Reference Voltage

For applications requiring a negative and positive reference voltage, the REF31xx and OPA703 can be used to

provide a dual-supply reference from a ±5-V supply. Figure 24 shows the REF3125 used to provide a ±2.5-V

supply reference voltage. The low drift performance of the REF31xx complement the low offset voltage and low

drift of the OPA703 to provide an accurate solution for split-supply applications.

Figure 24. REF3125 Combined With OPA703 to Create Positive and Negative Reference Voltages

8.4.2 Data Acquisition

Data acquisition systems often require stable voltage references to maintain accuracy. The REF31xx family

features stability and a wide range of voltages suitable for most microcontrollers and data converters. Figure 25,

Figure 26, and Figure 27 show basic data acquisition systems.

Figure 25. Basic Data Acquisition System 1