Datasheet

LM2902 Typical Single-Supply Applications
9/14
4 Typical Single-Supply Applications
Figure 19. AC coupled inverting amplifier Figure 20. AC coupled non-inverting amplifier
Figure 21. Non-inverting DC gain Figure 22. DC summing amplifier
Figure 23. Active bandpass filter Figure 24. High input Z adjustable gain DC
instrumentation amplifier
1/4
LM2902
~
0
2V
PP
R
10k
Ω
L
C
o
e
o
R
6.2k
Ω
B
R
100k
Ω
f
R1
10k
Ω
C
I
e
I
V
CC
R2
100k
Ω
C1
10
µ
F
R3
100k
Ω
A=-
R
R1
V
f
(as shown A = -10)
V
1/4
LM2902
~
0
2V
PP
R
10k
Ω
L
C
o
e
o
R
6.2k
Ω
B
C1
0.1
µ
F
e
I
V
CC
(as shown A = 11)
V
A=1+
R2
R1
V
R1
100k
Ω
R2
1M
Ω
C
I
R3
1M
Ω
R4
100k
Ω
R5
100k
Ω
C2
10
µ
F
R1
10k
Ω
R2
1M
Ω
1/4
LM2902
10k
Ω
e
I
e
O
+5V
e
O
(V)
(mV)
0
A
V
=1+
R2
R1
(As shown = 101)
A
V
1/4
LM2902
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) (e3 + e4)
to keep eo 0V
≥
≥
R3
10k
Ω
1/4
LM2902
e
1
e
O
R8
100k
Ω
R7
100k
Ω
C3
10
µ
F
V
CC
R5
470k
Ω
C2
330pF
R4
10M
Ω
R6
470k
Ω
R1
100k
Ω
C1
330pF
1/4
LM2902
1/4
LM2902
Fo = 1kHz
Q = 50
Av = 100 (40dB)
R3
100k
Ω
e
O
R1
100k
Ω
e
1
1/4
LM2902
R7
100k
Ω
R6
100k
Ω
R5
100k
Ω
e
2
R2
2k
Ω
Gain adjust
R4
100k
Ω
1/4
LM2902
1/4
LM2902
If R1 = R5 and R3 = R4 = R6 = R7
eo = [ 1 + ] (e2 - e1)
As shown eo = 101 (e2 - e1)
2R1
R2