MC3458_07 Datasheet, PDF(7/12 Page) ON Semiconductor – Dual, Low Power Operational Amplifiers

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MC3458_07 Datasheet, PDF (7/12 Pages) ON Semiconductor – Dual, Low Power Operational Amplifiers

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Vref

VCC

Vref

MC3458, MC3358

Triangle Wave

Output

1/2

MC3458

75 k

100 k

Vref

300 k

1/2

MC3458

f R1 +RC

4 CRf R1

if,

R2 R1

R2 +R1

Figure 14. Function Generator

Square Wave

Output

VCC

Vin

1/2

MC3458

CO 10 C

Vref

VCC

Given: fo center frequency

A(fo) gain at center frequency

Choose value fo, C.

Then:

Ï fo C

2 A(fo)

R1 R5

4Q2 R1 R3

For less than 10% error from operational amplifier

where, fo and BW are expressed in Hz.

Qo fo < 0.1

If source impedance varies, filter may be preceded with

voltage follower buffer to stabilize filter parameters.

Figure 15. Multiple Feedback Bandpass Filter

http://onsemi.com

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