Single/Dual/Triple/Quad

Operational Amplifiers

______________________________________________________________________________________

23

Figure 3. Level Detector—By using the ICL7612 in these appli-

cations, the circuits will follow rail-to-rail inputs.

+

-

TO CMOS OR

LPTTL LOGIC

100k

Ω

1M

Ω

+5

+5

Figure 4. Photocurrent Integrator—Low-leakage currents allow

integration times up to several hours.

ICL7611

+

+

-

-

1

µF

IH5040

Figure 5. Precise Triangle/Square Wave Generator—The fre-

quency and duty cycle are virtually independent of power sup-

ply.

+

-

+

-

1M

Ω

1M

Ω

880k

Ω

DUTY CYCLE

ICL7621

ICL7621

V-

V+

Figure 6. Averaging AC to DC Converter—Recommended for

Maxim’s ICL7106/ICL7107/ICL7109 A/D Converters.

ICL7621

+

-

ICL7621

-

+

10

µF

2.2M

Ω

20k

Ω

1M

Ω

20k

Ω

1.8k

Ω = 5%

SCALE

ADJUST

10k

Ω

0.05

µF

COMMON

TO

SUCCEEDING

INPUT

STAGE

Figure 7. Burn-In and Life Test Circuit

Figure 8. Input Guard for TO-99

V+

COMP

OUT

V-

+15V

+15V

10k

Ω

10k

Ω

100

Ω

NOTE 1

NOTE 2

NOTES:

1. ICL7611, 7612, 7616, 7631, 7632

2. ICL7611, 7612, 7616, 7621, 7622, 7631, 7641, 7642

BOTTOM VIEW

V

8

1

3

5

7

4

2

6

V+

OUTPUT

GUARD