8/21/97 4:00 PM

OP297

–9–

REV. D

PRECISION POSITIVE PEAK DETECTOR

ethylene to minimize dielectric absorption and leakage. The

of the OP297.

+

–

+

–

–

+

10k

Ω

10k

Ω

10k

Ω

1/2

OP-297

10k

Ω

2

3

1

100

Ω

±10mA

+15V

5

6

4

8

7

–15V

1/2

OP-297

=

100

Ω

= 10mA/V

Figure 31. Precision Current Pump

SIMPLE BRIDGE CONDITIONING AMPLIFIER

Figure 33 shows a simple bridge conditioning amplifier using

the OP297. The transfer function is:

∆R

R

+∆R









R

The REF43 provides an accurate and stable reference voltage

should be 0.1% or better with a low temperature coefficient.

0.1

µF

0.1

µF

–

+

1/2

OP-297

3

2

1

–

+

5

6

8

7

4

+15V

–15V

OUT

V

1k

Ω

IN

V

1N4148

2N930

1k

Ω

1k

Ω

RESET

H

C

1k

Ω

1/2

OP-297

Figure 32. Precision Positive Peak Detector

*Teflon is a registered trademark of the Dupont Company

Figure 33. A Simple Bridge Conditioning Amplifier Using the OP297

REF-43

R

R +

∆R

R

R

+5V

8

7

4

5

6

–5V

1/2

OP-297

1/2

OP-297

2

1

3

+5V

2

6

2.5V

4

–

+

–

+

=

∆R

R +

∆R

R

(

(