OPA734, OPA2734

OPA735, OPA2735

SBOS282B − DECEMBER 2003 − REVISED FEBRUARY 2005

www.ti.com

11

R

1

536k

Ω

R

1

536k

Ω

R

3

268k

Ω

OPA735

C

1

5nF

C

2

5nF

C

3

10nF

V

OUT

+5V

−5V

f

1

2

π RC

;where

R=R

C=C

(f

Figure 6. Twin-T Notch Filter

NOTE: FilterPro is a low-pass filter design program available for download at no cost from TI’s web site (www.ti.com).

The program can be used to easily determine component values for other cutoff frequencies or filter types.

68.0nF

C

2

C

3

6.80nF

R

3

20.8k

Ω

R

2

2.64k

Ω

C

1

15.0nF

R

1

10.6k

Ω

1/2

OP A2 735

1/2

O PA 2735

V

OUT

V

IN

Cutoff frequency = 2kHz for values shown.

Figure 7. High DC Accuracy, 3-Pole Low-Pass Filter

1/2

OP A 27 35

1/2

OP A 27 35

R

2

10 k

Ω

R

R

3

10 k

Ω

V

OUT

V

IN

C

1

1nF

D

1

C

1

1nF

NOTE: Dynamic range of the circuit is not reduced by

the diode voltage drop since the diode is not in the signal path.

Application Bulletin Precision Absolute Value Circuits (SBOA068)

is available at www.ti.com and provides further information about rectifier circuits.

Figure 8. Precision Full-Wave Rectifier with Full Dynamic Range