LM2904VD Motorola Inc, LM2904VD Datasheet - Page 6

• Manufacturer Part Number: LM2904VD
• Description: DUAL DIFFERENTIAL INPUT OPERATIONAL AMPLIFIERS
• Manufacturer: Motorola Inc

V ref =
V ref
6
1
2
V CC
1/2
LM358
+
–
Figure 12. Function Generator
f =
Triangle Wave
C
Output
4 CR f R1
R1 + R C
R f
V ref
R1
if,
75 k
R3
R3 =
R2 + R1
100 k
R2 R1
LM358, LM258, LM2904, LM2904V
1/2
LM358
+
–
300 k
R2
Square
Wave
Output
V in
Figure 13. Multiple Feedback Bandpass Filter
For less than 10% error from operational amplifier.
Where f o and BW are expressed in Hz.
If source impedance varies, filter may be preceded with voltage
follower buffer to stabilize filter parameters.
R1
Then:
Choose value f o , C
Given:
MOTOROLA ANALOG IC DEVICE DATA
R2
C
R3 =
R1 =
R2 =
A(f o ) = gain at center frequency
C
4Q 2 R1 –R3
f o = center frequency
2 A(f o )
R3
f o C
Q
R1 R3
R3
V ref
1/2
LM358
–
+
V CC
CO = 10 C
V ref =
Q o f o
BW
CO
1
2
< 0.1
V CC
V O