LM2904D/DT Просмотр технического описания (PDF) - STMicroelectronics
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LM2904D/DT Datasheet PDF : 22 Pages
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LM2904
Electrical characteristics
Typical single-supply applications
Figure 18. AC coupled inverting amplifier
Figure 19. AC coupled non-inverting amplifier
R1
CI 10kΩ
eI ~
R2
VCC 100k Ω
Rf
100k Ω
1/2
LM2904
RB
6.2kΩ
R3
100k Ω
AV=
-
Rf
R1
(as shown AV = -10)
Co
eo0
RL
10k Ω
C1
10 μF
2VPP
C1
0.1μF
eI ~
R1
100kΩ
CI
R3
1MΩ
C2
10μF
R2
1MΩ
1/2
LM2904
RB
6.2kΩ
A
V=
1
+
R2
R1
(as shown AV = 11)
Co
eo0
RL
10k Ω
R4
100kΩ
VCC
R5
100kΩ
2VPP
Figure 20. Non-inverting DC gain
Figure 21. DC summing amplifier
10kΩ
1/2
LM2904
AV= 1 +
R2
R1
(As shown AV = 101)
eO +5V
e 1 100kΩ
100kΩ
1/2
LM2904
eO
e 2 100kΩ
R1
10kΩ
R2
1MΩ
e 3 100kΩ
e 4 100kΩ
100kΩ
0
e I (mV)
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
R1
100kΩ
+V1
+V2
R2
100kΩ
1/2
LM2904
R3
100kΩ
If R1 = R5 and R3 = R4 = R6 = R7
eo = [ 1 + 2R1 ] (e2 - e1)
R2
As shown eo = 101 (e2 - e1)
R4
100kΩ
1/2
LM2904
1/2
II
I B LM2904
eo
eI
IB
2N 929
Vo
IB
1.5MΩ
0.001μ F
IB
3MΩ
IB
1/2
LM2904
Input current compensation
11/22
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