LM2904W datasheet(11/28 Pages) STMICROELECTRONICS

11 / 28 page

Typical single-supply applications

Figure 21. AC coupled inverting amplifier

1/2

LM2904

2VPP

10 kΩ

e o

6.2 kΩ

100 kΩ

10 kΩ

C I

e I

VCC

100 kΩ

10µF

100 kΩ

A = -

(a s s hown A

= -10)

Figure 22. AC coupled non-inverting amplifier

1/2

LM2904

2 VPP

10 kΩ

e o

6.2 kΩ

0.1 µF

e I

VCC

(

= 11)

A = 1 + R2

100 kΩ

1 MΩ

C I

1 MΩ

100 kΩ

10 µF

as shown A

Figure 23. Non-inverting DC gain

10 kΩ

1 MΩ

1/2

LM2904

10 kΩ

e I

e O

+5 V

(mV)

AV = 1 +

(a s s how n

= 101 )

Figure 24. DC summing amplifier

1/2

LM2904

e O

e 4

e 3

e 2

e 1

100 kΩ

eo = e1 + e2 - e3 - e4

where (e1 + e2)

(e3 + e4)

to keep eo

0 V

≥

Figure 25. High input Z, DC differential amplifier

1/2

LM2904

100 kΩ

+V2

+V1

1/2

LM2904

eo = [ 1 +

] (e2 - e1)

As sho wn eo = 101 (e2 - e1)

2R1

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

Figure 26. Using symmetrical amplifiers to reduce input

current

1/2

LM2904

2N 92 9

0.001µF

3 MΩ

e o

I I

e I

Input current compensation

1.5 MΩ

1/2

LM2904

LM2904, LM2904A, LM2904W, LM2904AW

Typical single-supply applications

DS0508 - Rev 20

page 11/28

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