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LM2904VDR2 Folha de dados(PDF) 9 Page - ON Semiconductor

Nome de Peças LM2904VDR2
Descrição Electrónicos  DUAL DIFFERENTIAL INPUT OPERATIONAL AMPLIFIERS
Download  16 Pages
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM2904VDR2 Folha de dados(HTML) 9 Page - ON Semiconductor

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LM358, LM258, LM2904, LM2904A, LM2904V, NCV2904
http://onsemi.com
9
2
1
Vref =VCC
1
2
Figure 15. Function Generator
Figure 16. Multiple Feedback Bandpass Filter
For less than 10% error from operational amplifier.
If source impedance varies, filter may be preceded with voltage
follower buffer to stabilize filter parameters.
Where fo and BW are expressed in Hz.
Qo fo
BW
< 0.1
Given:
fo = center frequency
A(fo) = gain at center frequency
Choose value fo, C
Then: R3 =
Q
π fo C
R3
R1 = 2 A(f
o)
R1 R3
4Q2 R1 -R3
R2 =
+
-
+
-
-
+
Vref =VCC
Vref
f =
R1 + RC
4 CRf R1
R3 =
R2 R1
R2 + R1
R2
300 k
75 k
R3
R1
C
Triangle Wave
Output
Square
Wave
Output
VCC
R3
R1
R2
Vref
Vin
C
C
VO
CO
CO = 10 C
Rf
if,
1/2
LM358
Vref
1/2
LM358
1/2
LM358
100 k


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