OPA734, OPA2734

OPA735, OPA2735

SBOS282A − DECEMBER 2003 − REVISED FEBRUARY 2004

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10

VIN

VREF

R1

R2

±10V

5V

42.2k

Ω

14.7k

Ω

±5V

5V

20.8k

Ω

19.6k

Ω

0V to 10V

5V

20.8k

Ω

5.11k

Ω

0V to 5V

5V

10.5k

Ω

10k

Ω

Figure 4. Driving ADC

R

4

10k

Ω

R

3

6.8k

Ω

R

1

22k

Ω

TPS434 Thermopile

R

5

1.5M

Ω

+5V

R

7

10k

Ω

R

8

10k

Ω

R

2

1k

Ω

OPA735

C

2

100nF

C

3

1

µF

−5V

R

9

10k

Ω

+5V

1/2

OPA2703

C

4

1

µF

−5V

R

6

11k

Ω

+5V

1/2

OPA2703

−5V

−5V

REF1112

NOTE: The TPS434, by Perkin Elmer Optoelectronics is a thermopile detector

with integrated thermistor for cold−junction reference.

Figure 5. Thermopile Non-Contact Surface Temperature Measurement

ADS8342

ADS8325

ADS1100

V

IN

V

REF

R

R

3

10k

Ω

C

1

1nF

C

F

500pF

0.1V to 4.9V

R

F

300

Ω

R

2

R

1

C

Optional filter for use

with SAR−type

converters

operating at

sampling rates of

50kHz and below.

+5V

OPA735