Datasheet

®
INA103
12
FIGURE 12. Microphone Preamplifier with Provision for Phantom Power Microphones.
FIGURE 13. Instrumentation Amplifier with Shield Driver.
FIGURE 14. Gain-of-100 INA103 with FET Buffers.
11
10
7
V
IN
16
15
13
14
6
2
1
INA103
∆
V
IN
∆
V = 100
OUT
–
+
OPA627
–
+
OPA627
Gain = 100V/V
(40dB)
11
10
7
16
15
13
14
6
2
1
V
OUT
INA103
10Ω
1kΩ
Gain
Adjust
2.2kΩ
240Ω
47µF/63V
+
2.2kΩ
240Ω
47µF/63V
+
+48V
20dB
Pad
20dB
Pad
47kΩ
6.8kΩ
6.8kΩ
1
3
2
cm
1µF
100kΩ
–
+
OPA627
Phantom
Power
Output offset voltage
control loop.
12
5
16
15
13
14
6
2
1
INA103
11
10
7
V
OUT
10kΩ
10kΩ
V
IN
∆
–
+
10kΩ
10kΩ
OPA602
100Ω
Shield driver minimizes degradation of CMR due
to distributed capacitance on the input lines.