LM2902P STMicroelectronics, LM2902P Datasheet - Page 9

• Manufacturer Part Number: LM2902P
• Description: LOW POWER QUAD OPERATIONAL AMPLIFIERS
• Manufacturer: STMicroelectronics

TYPICAL SINGLE - SUPPLY APPLICATIONS
ACTIVER BANDPASS FILTER
USING SYMMETRICAL AMPLIFIERS TO REDUCE INPUT CURRENT (GENERAL CONCEPT)
e
1
F
Q = 50
A
10k
O
V
R3
= 100 (40dB)
= 1kHz
LM2902
1/4
100k
LM2902
R1
1/4
10M
R4
1.5M
e
330pF
C2
I
470k
I
I
100k
R6
B
B
R8
I
I
330pF
C1
LM2902
2N 929
1/4
10 F
C3
I
B
470k
100k
R5
R7
LM2902
3M
1/4
I
0.001 F
I
B
e
V
B
O
CC
LM2902
HIGH INPUT Z, DC DIFFERENTIAL AMPLIFIER
1/4
Aux. a mplifier for input
+V1
+V2
current compe ns a tion
For
(CMRR depends on this resistor ratio match)
100k
e
As shown e
R
R
o
R 1
1
2
1
e
R
R
R
R
o
4
3
4
3
LM29 02
e
o
100k
1/4
2
R2
= (e
e
1
2
- e
100k
1
R 3
)
LM29 0 2
100k
1/4
R4
LM2902
9/14
V
o