Datasheet

LM2904, LM2904A Electrical characteristics
Doc ID 2471 Rev 14 11/24
3.1 Typical single-supply applications
Figure 18. AC coupled inverting amplifier Figure 19. AC coupled non-inverting amplifier
1/2
LM2904
~
0
2V
PP
R
10 k
Ω
L
C
o
e
o
R
6.2 k
Ω
B
R
100 kΩ
f
R1
10 k
Ω
C
I
e
I
V
CC
R2
100 kΩ
C1
10
μ
F
R3
100 kΩ
A=-
R
R1
V
f
(as shown A = -10)
V
1/2
LM2904
~
0
2V
PP
R
10 k
Ω
L
C
o
e
o
R
6.2 k
Ω
B
C1
0.1 μF
e
I
V
CC
(as shown A = 11)
V
A=1+
R2
R1
V
R1
100 k
Ω
R2
1 M
Ω
C
I
R3
1 M
Ω
R4
100 k
Ω
R5
100 k
Ω
C2
10
μ F
Figure 20. Non-inverting DC gain Figure 21. DC summing amplifier
R1
10 k
Ω
R2
1 M
Ω
1/2
LM2904
10 k
Ω
e
I
e
O
+5V
e
O
(V
)
(mV)
0
A
V
=1+
R2
R1
(Asshown = 101)
A
V
1/2
LM2904
e
O
e
4
e
3
e
2
e
1
100 k Ω
100 k Ω
100 k Ω
100 k Ω
100 k Ω
100 k Ω
eo = e1 + e2 - e3 - e4
where (e1 + e2) (e3 + e4)
to keep eo 0V
≥
≥
Figure 22. High input Z, DC differential
amplifier
Figure 23. Using symmetrical amplifiers to
reduce input current
+
1/2
LM2904
R1
100 k
Ω
R2
100 k
Ω
R4
100 k
Ω
R3
100 k
Ω
+V2
V1
V
o
1/2
LM2904
If R1 = R5 and R3 = R4 = R6 = R7
eo = [ 1 + ] (e2 - e1)
As shown eo = 101 (e2 - e1)
2R1
R2
I
B
2N 929
0.001 μ F
I
B
3 M Ω
I
B
e
o
I
I
e
I
I
B
I
B
Inputcurrent compensation
1.5 M Ω
1/2
LM2904
1/2
LM2904