LM2903D/DT Ver la hoja de datos (PDF) - STMicroelectronics

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LM2903D/DT

Low-power dual voltage comparator

STMicroelectronics 

Typical application schematics

LM2903

Figure 14. Low frequency op- amp with offset Figure 15. Zero crossing detector

adjust

(single power supply)

5V

5V

Offset adjust

100 kΩ

R2

RS

R1

el ~

1 MΩ

1 kΩ

1 MΩ

15 kΩ

1/ 2

LM2903

0.5 μ F

R1

100 kΩ

5V

2N 2222

5.1 kΩ

e

l

100 kΩ

5.1 kΩ

1N4148

100 kΩ

1/ 2

LM2903

20 MΩ

eo

10 kΩ

5.1 kΩ

Figure 16. Limit comparator

VCC (12 V)

V

(ref)

high

2RS

RS

10 kΩ

1/ 2

LM2903

Lamp

eI ~

V(ref)

low

2RS

1/2

LM2903

2N 2222

Figure 18. Crystal controlled oscillator

VCC = 15 V

200 kΩ

0.1 μF

100 kΩ

1/2

LM2903

2 kΩ

VCC

0

eo

200 kΩ

f = 100 kHz

Figure 17. Split-supply applications - zero

crossing detector

15 V

eI ~

1/2

LM2903

15 V

5.1 kΩ

e

o

Figure 19. Comparator with a negative

reference

15 V

eI ~

1/2

LM2903

5V

15 V

5.1 kΩ

eo

8/18

Doc ID 2470 Rev 10

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