REF3112-Q1 Datasheet, PDF (13/23 Pages) Texas Instruments – 15 ppm Maximum, 100-uA, SOT-23 Series Voltage Reference

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REF3112-Q1, REF3120-Q1, REF3125-Q1
REF3130-Q1, REF3133-Q1, REF3140-Q1
SBVS299 – APRIL 2017
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.
+5V
REF3125-Q1
10kW
10kW
+5V
+2.5V
OPA703
-2.5V
-5V
Copyright © 2016, Texas Instruments Incorporated
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.
3.3V
REF3133-Q1
V+
ADS7822
V_REF
V_CC
0.1mF
5W
+
1mF to 10mF
+ _{1mF to}
10mF
V_S
GND
V_IN
+In
CS
-In
D_OUT
GND DCLOCK
Microcontroller
Copyright © 2016, Texas Instruments Incorporated
Figure 25. Basic Data Acquisition System 1
Copyright © 2017, Texas Instruments Incorporated
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Product Folder Links: REF3112-Q1 REF3120-Q1 REF3125-Q1 REF3130-Q1 REF3133-Q1 REF3140-Q1