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LM2904W Datasheet(PDF) 7 Page - STMicroelectronics

Part # LM2904W
Description  LOW POWER DUAL OPERATIONAL AMPLIFIERS
PDF  10 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LM2904W Datasheet(HTML) 7 Page - STMicroelectronics

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LM2904W
7/10
DC SUMMING AMPLIFIER
HIGH INPUT Z, DC DIFFERENTIAL AMPLIFIER
USING SYMMETRICAL AMPLIFIERS TO
REDUCE INPUT CURRENT
HIGH INPUT Z ADJUSTABLE GAIN DC
INSTRUMENTATION AMPLIFIER
LOW DRIFT PEAK DETECTOR
ACTIVER BADPASS FILTER
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)
(e3 + e4)
to keep eo
0V
≥
≥
+
1/2
LM2904
R1
100k
Ω
R2
100k
Ω
R4
100k
Ω
R3
100k
Ω
+V2
V1
Vo
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
µF
I
B
3M
Ω
I
B
eo
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
eo
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
Vo
VCC
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)
R3
100k
Ω
e
O
R1
100k
Ω
e
1
1/2
LM2904
R7
100k
Ω
R6
100k
Ω
R5
100k
Ω
e
2
R2
2k
Ω
Gain adjust
R4
100k
Ω
1/2
LM2904
1/2
LM2904
If R1 = R5 and R3 = R4 = R6 = R7
eo = [ 1 +
] (e2 - e1)
As shown eo = 101 (e2 - e1)
2R1
R2



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