MC3403D 参数 Datasheet PDF下载

MC3303 - MC3403 - MC3503

APPLICATION INFORMATION

(continued)

FUNCTION GENERATOR

R2

300kΩ

V

(ref)

= 1 V

CC

2

V

(ref)

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MC3403

Triangle wave output

R3

75kΩ

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MC3403

Square wave output

R1

100kΩ

C

V

(ref)

R

f=

R1 + R2

4 CR

f

R1

f

if R3 =

R2 R1

R2 + R1

MULTIPLE FEEDBACK BANDPASS FILTER

C

R1

e

I

C

R3

V

CC

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MC3403

C

O

R2

V

(ref)

C

O

= 10C

V

(ref)

= 1 V

CC

2

Q

•

πf

o

C

R3

R1

=

•

2A

(

f

o

)

R1 R5

R2

=

4Q

2

R1− R5•

R3

=

e

o

Given

f

o

= Center frequency ; choose values f

o

, C then

A (f

o

) = Gain at center frequency

For less than 10% error from operational amplifier

Q

o

f

o

< 0.1 where f

o

and BW are expressed in Hz

BW

If source impedance varies, filter may be preceded with voltage follower buffer to stabilize filter parameters

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