LM2902(1998) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
LM2902 Datasheet PDF : 14 Pages
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LM2902
TYPICAL SINGLE - SUPPLY APPLICATIONS
NON-INVERTING DC GAIN
DC SUMMING AMPLIFIER
e 1 100kΩ
10kΩ
1/4
LM2902
AV= 1 +
R2
R1
(As s hown AV = 101)
e O +5V
R1
10kΩ
R2
1MΩ
0
e I (mV)
100kΩ 1/4
eO
LM2902
e 2 100kΩ
e 3 100kΩ
1 0 0 kΩ
e 4 100kΩ
HIGH INPUT Z ADJUSTABLE GAIN DC
INSTRUMENTATION AMPLIFIER
eo = e1 + e2 - e3 - e4
where (e1 + e2) ≥ (e3 + e4)
to keep eo ≥ 0V
LOW DRIFT PEAK DETECTOR
R1
100kΩ
e1
R2
2kΩ
1/4
LM2902
G ain adjus t
R5
100kΩ
R3
100kΩ
R4
100kΩ
1/4
eO
LM2902
1/4
LM290 2
R6
100kΩ
R7
100kΩ
e2
if R1 = R5 and R3 = R4 = R6 = R7
eo
=
[
1+
2R1]
R2
(e2
−
e1)
As shown eo = 101 (e2 - e1).
8/14
IB
1/4
1/4
IB LM2902
eo
LM2902
eI
C
1µF *
2IB
Zo
ZI
2N 929 0.001µF
2IB
IB
R
1 MΩ
3R
3 MΩ
IB
1/4
LM2902
Input curre nt
compe ns a tion
* P olyca rbona te or polyethylene
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