Datasheet

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
-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
REF5020-Q1, REF5025-Q1, REF5030-Q1
REF5040-Q1, REF5045-Q1, REF5050-Q1
www.ti.com SBOS456G –SEPTEMBER 2008–REVISED OCTOBER 2013
APPLICATION CIRCUITS
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 5-V supply. Figure 30 shows the REF5025 used to provide a 2.5-V 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 R
1
and R
2
.
Figure 30. The REF5025 and OPA735 Create Positive and Negative Reference Voltages
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 31
shows the REF5040 in a basic data acquisition system.
Figure 31. Basic Data Acquisition System
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