LM2902AWYDT(2013) Просмотр технического описания (PDF) - STMicroelectronics

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производитель

LM2902AWYDT
(Rev.:2013)

Low-power quad operational amplifier

STMicroelectronics 

LM2902W

Typical single-supply applications

Figure 24. High input Z, DC differential amplifier

Figure 25. Low drift peak detector

R1

100 kΩ

+V1

+V2

R2

100 kΩ

1/4

LM2902

R3

100 kΩ

eo = [ 1 +

R4

R3

]

(e2

-

e1)

As shown eo = (e2 - e1)

R4

100 kΩ

1/4

LM2902

IB

1/4

1/4

I B LM2902

eo

LM2902

eI

C

1 μF *

2I B

Zo

ZI

2N 929 0.001 μF

Vo

2IB

IB

R

1 MΩ

3R

3 MΩ

IB

1/4

LM2902

Input current

compensation

* Polycarbonate or polyethylene

Figure 26. Using symmetrical amplifiers to

reduce input current (general concept)

1/4

II

I B LM2902

eo

eI

IB

2N 929

IB

1.5 MΩ

0.001 μF

IB

3 MΩ

IB

1/4

LM2902

Aux. amplifier for input

current compensation

DocID9922 Rev 9

11/18

18

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