REF5010_13 Datasheet, PDF (12/28 Pages) Texas Instruments – Low-Noise, Very Low Drift, Precision VOLTAGE REFERENCE

REF5010, REF5020
REF5025, REF5030
REF5040, REF5045, REF5050
SBOS410E – JUNE 2007 – REVISED JUNE 2010
APPLICATION CIRCUITS
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NEGATIVE REFERENCE VOLTAGE
For applications requiring a negative and positive
reference voltage, the REF50xx and OPA735 can be
used to provide a dual-supply reference from a 5V
supply. Figure 33 shows the REF5025 used to
provide a 2.5V supply reference voltage. The low drift
performance of the REF50xx complements the low
offset voltage and zero drift of the OPA735 to provide
an accurate solution for split-supply applications.
Care must be taken to match the temperature
coefficients of R₁ and R₂.
+5V
REF5025
DNC
DNC
V_IN
TEMP
NC
V_OUT
GND TRIM/NR
R₁
10kW _R2
10kW
+2.5V
1mF
+5V
DATA ACQUISITION
Data acquisition systems often require stable voltage
references to maintain accuracy. The REF50xx family
features low noise, very low drift, and high initial
accuracy for high-performance data converters.
Figure 34 shows the REF5040 in a basic data
acquisition system.
Input
Signal
0V to 4V
+5V
OPA365
R₁
50W
C₁
1.2nF
+5V
+IN
V_DD
ADS8326
-IN _{REF GND}
+5V
C_BYPASS
1mF
REF5040
V_IN V_OUT
GND
C₂
22mF
Figure 34. Basic Data Acquisition System
OPA735
-2.5V
-5V
NOTE: Bypass capacitors not shown.
Figure 33. The REF5025 and OPA735 Create
Positive and Negative Reference Voltages
12
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