LM2902
TYPICAL SINGLE - SUPPLY APPLICATIONS
NON-INVERTING DC GAIN
DC SUMMING AMPLIFIER
e
1
100k
Ω
A
V
= 1 +
R2
R1
10k
Ω
1/4
LM2902
e
O
+5V
(As s hown A
V
= 101)
100k
Ω
e
2
100k
Ω
100k
Ω
1/4
LM2902
e
O
R2
1M
Ω
R1
10k
Ω
e
O
(V)
e
3
100k
Ω
0
e
I
(mV)
e
4
100k
Ω
e
o
= e
1
+ e
2
- e
3
- e
4
where (e
1
+ e
2
)
≥
(e
3
+ e
4
)
to keep e
o
≥
0V
HIGH INPUT Z ADJUSTABLE GAIN DC
INSTRUMENTATION AMPLIFIER
LOW DRIFT PEAK DETECTOR
R1
100k
Ω
I
B
R3
100k
Ω
R4
100k
Ω
e
I
1/4
LM2902
e
O
1/4
1/4
LM2902
e
1
1/4
LM2902
I
B LM2902
1
µ
F
e
o
C
*
2I
B
Z
o
0.001
µ
F
Z
I
2I
B
R
1M
Ω
R2
2k
Ω
G ain adjus t
2N 929
R5
100k
Ω
I
B
3R
3M
Ω
1/4
LM2902
1/4
LM2902
e
2
R6
100k
Ω
R7
100k
Ω
I
B
Input curre nt
compe ns a tion
* P olyca rbona te or polyethylene
if R
1
= R
5
and R
3
= R
4
= R
6
= R
7
2R
1
e
o
=
[ 1+
]
(e
2
−
e
1
)
R
2
As shown e
o
= 101 (e
2
- e
1
).
8/14
STMICROELECTRONICS [ STMICROELECTRONICS ]
