OP113FSZ datasheet(15/24 Pages) AD

15 / 24 page

OP113/OP213/OP413

Rev. F | Page 15 of 24

4.02kΩ

100Ω

+15V

–15V

1/2

OP213

8.25kΩ

50Ω

+15V

–15V

AD588BQ

1/2

OP213

–

RG FULL SCALE ADJUST

RW1

RW2

RW3

VOUT (10mV/°C)

–1.5V = –150°C

+5V = +500°C

5kΩ

LINEARITY

ADJUST

@1/2 FS

49.9kΩ

10µF

100Ω

RTD

100Ω

Figure 43. Ultraprecision RTD Amplifier

To calibrate the circuit, first immerse the RTD in a 0°C ice bath

or substitute an exact 100 Ω resistor in place of the RTD. Adjust

the zero adjust potentiometer for a 0 V output, and then set R9,

linearity adjust potentiometer, to the middle of its adjustment

range. Substitute a 280.9 Ω resistor (equivalent to 500°C) in

place of the RTD, and adjust the full-scale adjust potentiometer

for a full-scale voltage of 5 V.

To calibrate out the nonlinearity, substitute a 194.07 Ω resistor

(equivalent to 250°C) in place of the RTD, and then adjust the

linearity adjust potentiometer for a 2.5 V output. Check and

readjust the full-scale and half-scale as needed.

Once calibrated, the amplifier outputs a 10 mV/°C temperature

coefficient with an accuracy better than ±0.5°C over an RTD

measurement range of −150°C to +500°C. Indeed the amplifier

can be calibrated to a higher temperature range, up to 850°C.

A HIGH ACCURACY THERMOCOUPLE AMPLIFIER

Figure 44 shows a popular K-type thermocouple amplifier with

cold-junction compensation. Operating from a single 12 V

supply, the OPx13 family’s low noise allows temperature

measurement to better than 0.02°C resolution over a 0°C to

1000°C range. The cold-junction error is corrected by using an

inexpensive silicon diode as a temperature measuring device.

It should be placed as close to the two terminating junctions as

physically possible. An aluminum block might serve well as an

isothermal system.

12V

REF02EZ

12V

1N4148

0.1µF

–

K-TYPE

THERMOCOUPLE

40.7µV/°C

5.62kΩ

53.6Ω

200Ω

2.74kΩ

–

1/2

OP213

0V TO 10V

(0°C TO 1000°C)

10µF

0.1µF

124kΩ

40.2kΩ

10.7kΩ

453Ω

Figure 44. Accurate K-Type Thermocouple Amplifier

R6 should be adjusted for a 0 V output with the thermocouple

measuring tip immersed in a 0°C ice bath. When calibrating, be

sure to adjust R6 initially to cause the output to swing in the

positive direction first. Then back off in the negative direction

until the output just stops changing.

AN ULTRALOW NOISE, SINGLE SUPPLY

INSTRUMENTATION AMPLIFIER

Extremely low noise instrumentation amplifiers can be built

using the OPx13 family. Such an amplifier that operates from a

single supply is shown in Figure 45. Resistors R1 to R5 should

be of high precision and low drift type to maximize CMRR

performance. Although the two inputs are capable of operating

to 0 V, the gain of −100 configuration limits the amplifier input

common-mode voltage to 0.33 V.

*ALL RESISTORS ±0.1%, ±25ppm/°C.

–

1/2

OP213

1/2

OP213

5V TO 36V

GAIN =

+ 6

–

VOUT

*R4

10kΩ

20kΩ

VIN

*R1

10kΩ

*R2

10kΩ

*R3

10kΩ

*RG

(200Ω + 12.7Ω)

Figure 45. Ultralow Noise, Single Supply Instrumentation Amplifier

SUPPLY SPLITTER CIRCUIT

The OPx13 family has excellent frequency response

characteristics that make it an ideal pseudoground reference

generator, as shown in Figure 46. The OPx13 family serves as a

voltage follower buffer. In addition, it drives a large capacitor

that serves as a charge reservoir to minimize transient load

changes, as well as a low impedance output device at high

frequencies. The circuit easily supplies 25 mA load current with

good settling characteristics.

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