V+ V–
V+ V–
G1 = 1, 2, 4, 8
+15V –15V
G2 = 1, 10, 100
8
6
G = 0.1, 1, 10
VO
–
+
VIN
D1
D2
102kΩ
7
4
VO
PGA103
PGA205
PGA103
VIN
A0
A0
VIN
3
G = G1 • G2
A1
A1
1
Accepts inputs
to ±120V.
2
11.3kΩ
True
instrumentation
amplifier input.
D1, D2; IN4148
A1 A0
GAIN
1
2
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
FIGURE 5. Wide Input Voltage Range Amplifer.
4
8
10
20
40
80
100
200
400
800
FIGURE 4. Programmable Gain Instrumentation Amplifier.
G1
G2 = 1, 10, 100
MODEL
CHARACTERISTICS
+
–
VIN
INA103
INA105
INA106
INA114
INA117
INA111
INA131
Low Noise, 1nV/√Hz IA
G = 1 Difference Amp
G = 10 Difference Amp
Resistor-Programmed Gain, Precision
±200V C-M Input Range Difference Amp
FET Input, High Speed IA
Precision, G = 100 IA
VO
G = G1 • G2
PGA103
INA
VIN
A1 A0
FIGURE 6. Instrumentation Amplifier with Programmable Gain Output Amp.
®
7
PGA103
TI [ TEXAS INSTRUMENTS ]
