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 F

m

1 F

m

REF5050

+15 V

In

Out

(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

-15V

-30V

30V

15V

DAC8581

Input = ± 5V

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.

Figure 48. RTD Amplifier with Linearization

22

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