LM2904 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

LM2904

Low-power dual operational amplifier

STMicroelectronics 

LM2904, LM2904A

Electrical characteristics

3.1

Typical single-supply applications

Figure 18. AC coupled inverting amplifier

Figure 19. AC coupled non-inverting amplifier

R1

CI 10 kΩ

eI ~

R2

VCC 100 kΩ

Rf

100 kΩ

1/2

LM2904

RB

6.2 kΩ

R3

100 kΩ

AV= -

Rf

R1

(as shown AV = -10)

Co

eo0

RL

10 kΩ

C1

10 μF

2VPP

C1

0.1 μF

eI ~

R1

100 kΩ

CI

R3

1 MΩ

C2

10 μF

R2

1 MΩ

1/2

LM2904

RB

6.2 kΩ

A

V=

1

+

R2

R1

(as shown AV = 11)

Co

eo0

RL

10 kΩ

R4

100 kΩ

VCC

R5

100 kΩ

2VPP

Figure 20. Non-inverting DC gain

Figure 21. DC summing amplifier

10 kΩ

1/2

LM2904

AV= 1 +

R2

R1

(As shown AV = 101)

eO +5V

e 1 100 kΩ

100

kΩ

1/2

LM2904

eO

e 2 100 kΩ

R1

10 kΩ

R2

1 MΩ

e 3 100 kΩ

e 4 100 kΩ

100 kΩ

0

e I (mV)

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

R1

100 kΩ

+V1

+V2

R2

100 kΩ

1/2

LM2904

R3

100 kΩ

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

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

R2

As shown eo = 101 (e2 - e1)

R4

100 kΩ

1/2

LM2904

1/2

II

I B LM2904

eo

eI

IB

2N 929

Vo

IB

1.5 MΩ

0.001 μF

IB

3 MΩ

1/2

LM2904

Input current compensation

IB

Doc ID 2471 Rev 14

11/24

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