Diodes AP358 - Manual (Page 6)

AP358
LOW POWER DUAL OPERATIONAL AMPLIFIERS
AP358
Document number: DS31007 Rev. 6 - 2
6 of 16
www.diodes.com
July 2010
© Diodes Incorporated
Typical Single-Supply Circuit (Continued) (V
+
=5.0V
DC
)
Bandpass Active Filter
+
-
1/2 AP358
R1
390K
V
IN
C1
0.01 μF
+
V
O
V +
+
-
1/2 AP358
C2
0.01 μF
C3
10 μF
R2
620K
R3
680
R4
390K
R5
39K
R6
120K
R7
100K
R8
100K
f
O
= 1.12KHz
Q = 25
+
-
1/2 AP358
+
-
1/2 AP358
+
-
1/2 AP358
+V
1
+V
2
R1
2K GAIN ADJUST
R2
100K
R3
100K
R4
100K
R5
100K
R6
100K
R7
100K
V
O
As Shown: V
O
= 101(V
2
-V
1
)
V
O
=( 1+ )(V
2
-V
1
)
2R
2
R
1
If R1 = R5 & R3 = R4 = R6 = R7 (CMRR depends on match)
High Input Z Adjustable-Gain
DC Instrumentation Amplifier
+
-
1/2 AP358
+
-
1/2 AP358
+V
IN
+V
O
I
IN
I
B
I
B
I
B
I
B
0.001 μF
I
B
R
1.5M
2R
3M
AUX AMP
INPUT CURRENT
COMPENSATION
Using Symmetrical Amplifiers to Reduce
Input Current (General Concept)
2N929*
*hi β AT 50 nA