LM2902 데이터 시트보기 (PDF) - ON Semiconductor
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LM2902 Datasheet PDF : 16 Pages
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LM324, LM324A, LM224, LM2902, LM2902V, NCV2902
1
Vref = 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
R2 R1
if R3 =
R2 + R1
Figure 16. 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 17. Multiple Feedback Bandpass Filter
Given: fo = center frequency
A(fo) = gain at center frequency
Choose value fo, C
Then:
R3 =
Q
p 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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