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-Q1

GND

Copyright © 2016, Texas Instruments Incorporated

OPA703

REF3125-Q1

+5V

-5V

+5V

10kW

10kW

+2.5V

-2.5V

Copyright © 2016, Texas Instruments Incorporated

13

REF3112-Q1, REF3120-Q1, REF3125-Q1

REF3130-Q1, REF3133-Q1, REF3140-Q1

www.ti.com

SBVS299 – APRIL 2017

Product Folder Links: REF3112-Q1 REF3120-Q1 REF3125-Q1 REF3130-Q1 REF3133-Q1 REF3140-Q1

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Copyright © 2017, 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-Q1 and OPA703 can be used

to provide a dual-supply reference from a ±5-V supply. Figure 24 shows the REF3125-Q1 used to provide a

±2.5-V supply reference voltage. The low drift performance of the REF31xx-Q1 complements the low offset

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

Figure 24. REF3125-Q1 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-Q1 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