7

FN2919.8

September 27, 2006

1

μF

ICL7611

+

-

+

λ

NOTE: Low leakage currents allow integration times up to several

hours.

FIGURE 3. PHOTOCURRENT INTEGRATOR

ICL7611

+

-

1M

ICL7611

+

-

1M

DUTY CYCLE

V-

V+

680k

Ω

1M

WAVEFORM GENERATOR

NOTE: Since the output range swings exactly from rail to rail, frequency

and duty cycle are virtually independent of power supply variations.

FIGURE 4. PRECISE TRIANGLE/SQUARE WAVE

GENERATOR

FIGURE 5. AVERAGING AC TO DC CONVERTER FOR A/D

CONVERTERS SUCH AS ICL7106, ICL7107,

ICL7109, ICL7116, ICL7117

FIGURE 6. BURN-IN AND LIFE TEST CIRCUIT

ICL7611

+

-

10

μF

ICL7611

+

-

20k

20k

1M

2.2M

COMMON

10k

0.5

μF

1.8k = 5%

SCALE

ADJUST

TO

SUCCEED-

ING

INPUT

STAGE

+

OUT

V+

V+

-8V

+8V

25k

V+

-

+ BAL

BAL

ICL7611, ICL7612