LM324 Просмотр технического описания (PDF) - Motorola => Freescale
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LM324 Datasheet PDF : 8 Pages
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LM324, LM324A, LM224, LM2902, LM2902V
Figure 12. Function Generator
Vref =
1
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 13. Multiple Feedback Bandpass Filter
VCC
R1
Vin
C
C
R3
–
1/4
LM324
CO
VO
Square
Wave
Output
R2
+
CO = 10 C
Vref
1
Vref = 2 VCC
Given: fo = center frequency
A(fo) = gain at center frequency
Choose value fo, C
Then:
R3 =
Q
π fo C
R3
R1 = 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.
MOTOROLA ANALOG IC DEVICE DATA
7
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