Datasheet

1/4
OPA4188
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
°
°
1/4
OPA4188
-15 V
15 V
U5
1/4
OPA4188
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
OPA4188
SBOS641B –JUNE 2012–REVISED MARCH 2013 www.ti.com
APPLICATION EXAMPLES
The application examples of Figure 44 and Figure 45 highlight only a few of the circuits where the OPA4188 can
be used.
Figure 44. Discrete INA + Attenuation for ADC with a 3.3-V Supply
(1) R
5
provides positive-varying excitation to linearize output.
Figure 45. RTD Amplifier with Linearization
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