Datasheet

OPA2180
RTD
Pt100
R
105.8k
5
W
(1)
V
OUT
R
60.4k
3
W
R
4.99k
1
W
R
49.1k
2
W
R
1kW
4
1 Fm 1 Fm
REF5050
+15V
InOut
(5V)
0 C=0V
200 C=5V
°
°
½
OPA2180
-15V
15V
U5
½
OPA2180
15V
-15V
U2
+
VCM
10
-V
DIFF
/2
V
DIFF
/2
R
1kW
5
R
1kW
7
R
500 W
G
V P
OUT
V N
OUT
U1
INA159
3.3V
V
OUT
Ref1
Ref2
Sense
OPA2180
OPA4180
SBOS584C –NOVEMBER 2011–REVISED DECEMBER 2012 www.ti.com
APPLICATION EXAMPLES
The application examples of Figure 30 and Figure 31 highlight only a few of the circuits where the OPAx180
family of devices can be used.
Figure 30. Discrete INA + Attenuation for ADC with 3.3-V Supply
(1) R
5
provides positive-varying excitation to linearize output.
Figure 31. RTD Amplifier with Linearization
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