LM2904WN 데이터 시트보기 (PDF) - STMicroelectronics

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LM2904WN

Low power dual operational amplifier

STMicroelectronics 

LM2904W

Electrical characteristics

Typical single-supply applications

Figure 18. AC coupled inverting amplifier

Figure 19. AC coupled non-inverting amplifier

R1

CI 10kΩ

eI ~

R2

VCC 100k Ω

Rf

100k Ω

1/2

LM2904

RB

6.2kΩ

R3

100k Ω

AV=

-

Rf

R1

(as shown AV = -10)

Co

eo0

RL

10k Ω

C1

10 μF

2VPP

C1

0.1μF

eI ~

R1

100kΩ

CI

R3

1MΩ

C2

10μF

R2

1MΩ

1/2

LM2904

RB

6.2kΩ

A

V=

1

+

R2

R1

(as shown AV = 11)

Co

eo0

RL

10k Ω

R4

100kΩ

VCC

R5

100kΩ

2VPP

Figure 20. Non-inverting DC gain

Figure 21. DC summing amplifier

e 1 100kΩ

10kΩ

1/2

LM2904

AV= 1 +

R2

R1

(As shown AV = 101)

eO +5V

100kΩ

1/2

LM2904

eO

e 2 100kΩ

R1

10kΩ

R2

1MΩ

0

e I (mV)

e 3 100kΩ

100kΩ

e 4 100kΩ

eo = e1 + e2 - e3 - e4

where (e1 + e2) ≥ (e3 + e4)

to keep eo ≥ 0V

Figure 22. High input Z, DC differential

amplifier

Figure 23. Using symmetrical amplifiers to

reduce input current

R2

100kΩ

R4

100kΩ

R1

100kΩ

R3

1/2

100kΩ

+V1

LM2904

1/2

LM2904

Vo

+V2

1/2

II

I B LM2904

eo

eI

IB

2N 929

0.001μ F

IB

IB

If R1 = R5 and R3 = R4 = R6 = R7

eo = [ 1 + 2R1 ] (e2 - e1)

R2

As shown eo = 101 (e2 - e1)

1.5MΩ

3MΩ

IB

1/2

LM2904

Input current compensation

9/19

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