OPAX189 datasheet(32/58 Pages) TI2

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9.2.5 Programmable Power Supply

Figure 9-6 shows the OPAx189 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 OPAx189 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 software file: Programmable Power-Supply Circuit.

DAC8581

Input = ± 5V

500 nF

OPAx189

±15V

+15V

1 k

10 k

GND

10 k

OPA548

±30V

+30V

40 k

500 nF

VOUT

Output = ± 25V

Figure 9-6. Programmable Power Supply

9.2.6 RTD Amplifier With Linearization

See Analog Linearization of Resistance Temperature Detectors for an in-depth analysis of Figure 9-7. Click the

following link to download the TINA-TI software file: RTD Amplifier with Linearization.

OPAx189

RTD

Pt100

105.8 kŸ

(1)

OUT

60.4 kŸ

4.99 kŸ

49.1 kŸ

1 kŸ

1 µF

REF5050

15 V

Out

(5 V)

0°C = 0 V

200°C = 5 V

(1) R5 provides positive-varying excitation to linearize output.

Figure 9-7. RTD Amplifier With Linearization

OPA189, OPA2189, OPA4189

SBOS830I – SEPTEMBER 2017 – REVISED OCTOBER 2021

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