Datasheet

-2.5V
+2.5V
+5V
NOTE:Bypasscapacitorsnotshown.
R
1
10kW
R
2
10kW
-5V
OPA735
+5V
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF5025
1 Fm
ADS8326
REF5040
REF
V
OUT
GND
+IN
-IN
V
IN
+5V
OPA365
Input
Signal
0Vto4V
+5V
+5V
V
DD
GND
C
BYPASS
1 Fm
R
1
50W
C
1
1.2nF
C
2
22 Fm
REF5010, REF5020
REF5025, REF5030
REF5040, REF5045, REF5050
SBOS410F –JUNE 2007–REVISED DECEMBER 2013 www.ti.com
APPLICATION CIRCUITS
DATA ACQUISITION
NEGATIVE REFERENCE VOLTAGE
Data acquisition systems often require stable voltage
For applications requiring a negative and positive
references to maintain accuracy. The REF50xx family
reference voltage, the REF50xx and OPA735 can be
features low noise, very low drift, and high initial
used to provide a dual-supply reference from a 5V
accuracy for high-performance data converters.
supply. Figure 33 shows the REF5025 used to
Figure 34 shows the REF5040 in a basic data
provide a 2.5V supply reference voltage. The low drift
acquisition system.
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 R
1
and R
2
.
Figure 34. Basic Data Acquisition System
Figure 33. The REF5025 and OPA735 Create
Positive and Negative Reference Voltages
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Product Folder Links: REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050