LM111, LM211, LM311

DIFFERENTIAL COMPARATORS WITH STROBES

SLCS007H – SEPTEMBER 1973 – REVISED AUGUST 2003

15

POST OFFICE BOX 655303

APPLICATION INFORMATION

15

µF

+

10 k

Ω

1 M

Ω

VCC+ = 15 V

TL081

Output

Input

VCC– = –15 V

2 k

Ω

+

–

Figure 25. Negative-Peak Detector

† R1 sets the comparison level. At comparison, the photodiode has less than 5 mV across it, decreasing dark current by an order of magnitude.

2N2222

2N3708

R1†

30 k

Ω

3.9 k

Ω

1 k

Ω

Output

to TTL

VCC+ = 5 V

1N2175

Figure 26. Precision Photodiode Comparator

‡ Transient voltage and inductive kickback protection

2N3708

VCC+

Inputs

TTL

Strobe

VCC–

‡

1 k

Ω

BAL/STRB

Figure 27. Relay Driver With Strobe