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
-2V
+2V
+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
REF5020
1 Fm
REF5020-EP, REF5025-EP
REF5040-EP, REF5050-EP
SBOS471A –APRIL 2010–REVISED JUNE 2010 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 5-V
accuracy for high-performance data converters.
supply. Figure 27 shows the REF5020 used to
Figure 28 shows the REF5040 in a basic data
provide a 2.5-V supply reference voltage. The low
acquisition system.
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 28. Basic Data Acquisition System
Figure 27. The REF5020 and OPA735 Create
Positive and Negative Reference Voltages
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Product Folder Link(s): REF5020-EP REF5025-EP REF5040-EP REF5050-EP