STMicroelectronics LM2904N Linear IC DIP8 Dual bip. op. amp. LM2904N Data Sheet
Product codes
LM2904N
Electrical Characteristics
LM2904
10/15
Figure 20. Non-inverting DC gain
Figure 21. DC summing amplifier
Figure 22. High input Z, DC differential
amplifier
Figure 23. Using symmetrical amplifiers to
reduce input current
Figure 24. Low drift peak detector
Figure 25. Active bandpass filter
R1
10k
Ω
R2
1M
Ω
1/2
LM2904
10k
Ω
e
I
e
O
+5V
e
O
(V
)
(mV)
0
A
V
= 1 +
R2
R1
(As shown
= 101)
A
V
1/2
LM2904
e
O
e
4
e
3
e
2
e
1
100k
Ω
100k
Ω
100k
Ω
100k
Ω
100k
Ω
100k
Ω
eo = e1 + e2 - e3 - e4
where (e1 + e2)
where (e1 + e2)
(e3 + e4)
to keep eo
0V
≥
≥
+
1/2
LM2904
R1
100k
Ω
R2
100k
Ω
R4
100k
Ω
R3
100k
Ω
+V2
V1
V
o
1/2
LM2904
If R1 = R5 and R3 = R4 = R6 = R7
eo = [ 1 + ] (e2 - e1)
eo = [ 1 + ] (e2 - e1)
As shown eo = 101 (e2 - e1)
2R1
R2
R2
I
B
2N 929
0.001
µF
I
B
3M
Ω
I
B
e
o
I
I
e
I
I
B
I
B
Input current compensation
1.5M
Ω
1/2
LM2904
1/2
LM2904
1/2
LM2904
I
B
2N 929
0.001
µ F
I
B
3R
3M
Ω
I
B
Input current
compensation
compensation
e
o
I
B
e
I
Z
o
Z
I
C
1
µ F
2I
B
R
1M
Ω
2I
B
1/2
LM2904
1/2
LM2904
1/2
LM2904
R8
100k
Ω
C3
10
µF
R7
100k
Ω
R5
470k
Ω
C1
330pF
V
o
V
CC
R6
470k
Ω
C2
330pF
R4
10M
Ω
R1
100k
Ω
R2
100k
Ω
+V1
R3
100k
Ω
1/2
LM2904
1/2
LM2904
Fo = 1kHz
Q = 50
Av = 100 (40dB)
Q = 50
Av = 100 (40dB)