OPA2188_15 Datasheet, PDF (18/28 Pages) Texas Instruments – 0.03-μV/°C Drift, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift OPERATIONAL AMPLIFIERS

OPA2188
SBOS525B – AUGUST 2011 – REVISED SEPTEMBER 2012
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APPLICATION EXAMPLES
The application examples of Figure 44 and Figure 45 highlight only a few of the circuits where the OPA2188 can
be used.
15 V
V_DIFF/2
+
VCM
10
-V_DIFF/2
U2
1/2
OPA2188
-15 V
R₅
1 kW
R_G
500 W
R₇
1 kW
-15 V
U5
1/2
OPA2188
V_OUTP
3.3 V
Ref 1
U1
INA159
Ref 2
Sense
V_OUTN
V_OUT
15 V
Figure 44. Discrete INA + Attenuation for ADC with 3.3-V Supply
1 mF
R₁
4.99 kW
RTD
Pt100
(5 V)
R₂
49.1 kW
+15 V
Out
In
REF5050
1 mF
R₃
60.4 kW
1/2
OPA2188
R₅
105.8 kW⁽¹⁾
V_OUT
0°C = 0 V
200°C = 5 V
R₄
1 kW
(1) R₅ provides positive-varying excitation to linearize output.
Figure 45. RTD Amplifier with Linearization
18
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