REF3012 Datasheet, PDF (13/26 Pages) Texas Instruments – 50ppm/C Max, 50UA in SOT23-3 CMOS VOLTAGE REFERENCE

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REF3012, REF3020, REF3025, REF3030, REF3033, REF3040
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.
+5V
REF3025
10 kW
10 kW
+5 V
+2.5 V
OPA703
-2.5 V
-5 V
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.
3.3 V
REF3033
V+
GND
5Ω
+ _{1 μF to}
10 μF
0.1 μF
V_REF
V_CC
ADS7822
V_S
+
1 μF to 10 μF
V_IN
+In
CS
–In
D_OUT
GND DCLOCK
Microcontroller
Figure 27. Basic Data Acquisition System 1
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