LM2904D Просмотр технического описания (PDF) - ON Semiconductor

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производитель

LM2904D

Single Supply Dual Operational Amplifiers

ON Semiconductor 

LM358, LM258, LM2904, LM2904A, LM2904V, NCV2904

Vref

=

1

2

VCC

Vref

Triangle Wave

Output

+

1/2

R3

LM358

−

75 k

R1

C

Vref

R2

300 k

100 k

+

1/2

LM358

−

Rf

f = R1 + RC

R2 R1

if, R3 =

4 CRf R1

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

http://onsemi.com

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