OPA188_15 Datasheet, PDF (22/34 Pages) Texas Instruments – Precision, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift Operational Amplifiers

OPA188
SBOS642A – MARCH 2013 – REVISED MARCH 2013
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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.
R₁
10k
DAC8581
Input = ± 5V
C₁
150pF
R₄
R₂
1k
C₂
500nF
40k
30V
15V
R₃
10k
OPA548
OPA188
-15V
-30V
Figure 47. Programmable Power Supply
VOUT _{VOUT = ± 25V}
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.
+15 V
1 mF
(5 V)
R₂
49.1 kW
Out
In
REF5050
R₃
60.4 kW
1 mF
R₁
4.99 kW
OPA188
V_OUT
0°C = 0 V
200°C = 5 V
RTD
Pt100
R₅
105.8 kW⁽¹⁾
R₄
1 kW
(1) R₅ provides positive-varying excitation to linearize output.
Figure 48. RTD Amplifier with Linearization
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