LM224(2002) 데이터 시트보기 (PDF) - ON Semiconductor

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LM224
(Rev.:2002)

Single Supply Quad Operational Amplifiers

ON Semiconductor 

LM324, LM324A, LM224, LM2902, LM2902V, NCV2902

Vref =

1

2

VCC

Vref

Triangle Wave

Output

+

1/4

LM324

-

C

R3

75 k

R1

100 k

Vref

R2

300 k

+

1/4

LM324

-

Rf

f = R1 + RC

4 CRf R1

if R3 = R2 R1

R2 + R1

Figure 15. Function Generator

Square

Wave

Output

R1

Vin

CC

R2

VCC

R3

-

1/4

LM324

+

CO

VO

CO = 10 C

Vref

1

Vref = 2 VCC

Figure 16. Multiple Feedback Bandpass Filter

Given:ąfoă=ăcenter frequency

A(fo)ă=ăgain at center frequency

Choose value fo, C

Then:

R3 =

Q

π fo C

R1 =

R3

2 A(fo)

R2 =

R1 R3

4Q2 R1 - R3

For less than 10% error from operational amplifier,

Qo fo

BW

< 0.1

where fo and BW are expressed in Hz.

If source impedance varies, filter may be preceded with

voltage follower buffer to stabilize filter parameters.

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