NCV2904DMR2G データシートの表示（PDF） - ON Semiconductor

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NCV2904DMR2G

Single Supply Dual Operation Amplifier

ON Semiconductor 

LM258, LM358, LM358A, LM358E, LM2904, LM2904A, LM2904E, LM2904V, NCV2904

Vref

=

1

2

VCC

Vref

Triangle Wave

Output

+

1/2

R3

LM358

-

75 k

R1

C

Vref

100 k

R2

300 k

+

1/2

LM358

-

Rf

f = R1 + RC

4 CRf R1

R2 R1

if, R3 =

R2 + R1

Figure 15. Function Generator

VCC

C

R3

R1

C

Vin

-

1/2

LM358

R2

+

Vref

VO

CO

CO = 10 C

Vref =

1

2

VCC

Square

Wave

Output

Given: fo = center frequency

A(fo) = gain at center frequency

Choose value fo, C

Then:

R3 =

Q

p fo C

R3

R1 = 2 A(fo)

R2

=

R1 R3

4Q2 R1 -R3

For less than 10% error from operational amplifier. Qo fo < 0.1

BW

Where fo and BW are expressed in Hz.

If source impedance varies, filter may be preceded with voltage

follower buffer to stabilize filter parameters.

Figure 16. Multiple Feedback Bandpass Filter

www.onsemi.com

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