Datasheet

OPA188
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
°
°
R
1
10k
R
2
1k
R
3
10k
R
4
40k
C
1
150pF
C
2
500nF
OPA188
OPA548 V
OUT
-15V
-30V
30V
+
+
15V
DAC8581
Input = ± 5V
V
OUT
= ± 25V
OPA188
SBOS642A –MARCH 2013–REVISED MARCH 2013 www.ti.com
Figure 47 shows the OPA188 configured as a precision programmable power supply using the 16-bit, voltage
output DAC8581 and the OPA548 high-current amplifier. This application amplifies the digital-to-analog converter
(DAC) voltage by a value of five and handles a large variety of capacitive and current loads. The OPA188 in the
front-end provides precision and low drift across a wide range of inputs and conditions. Click the following link to
download the TINA-TI file: Programmable Power-Supply Circuit.
Figure 47. Programmable Power Supply
Refer to the Applications Report, Analog linearization of resistance temperature detectors (SLYT442) for an in-
depth analysis of Figure 48. Click the following link to download the TINA-TI file: RTD Amplifier with
Linearization.
(1) R
5
provides positive-varying excitation to linearize output.
Figure 48. RTD Amplifier with Linearization
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