Datasheet

®
INA141
10
REF102
R
2
R
1
R
3
Pt100
Cu
Cu
V+
K
6
10.0V
4
2
INA141
V
O
Ref
100Ω = Pt100 at 0°C
FIGURE 4. ECG Amplifier With Right-Leg Drive.
FIGURE 5. Bridge Amplifier.
FIGURE 7. Thermocouple Amplifier With RTD Cold-
Junction Compensation.
SEEBECK
ISA COEFFICIENT
TYPE MATERIAL (
µV/°C) R
1
, R
2
E + Chromel 58.5 66.5kΩ
– Constantan
J + Iron 50.2 76.8kΩ
– Constantan
K + Chromel 39.4 97.6kΩ
– Alumel
T + Copper 38.0 102kΩ
– Constantan
INA141
V
O
C
1
0.1µF
OPA602
Ref
R
1
1MΩ
f
–3dB
=
1
2πR
1
C
1
= 1.59Hz
V
IN
+
–
FIGURE 6. AC-Coupled Instrumentation Amplifier.
INA141
I
B
R
1
V
IN
–
+
A
1
I
O
Load
I
O
= • G
V
IN
R
1
Ref
A
1
I
B
Error
OPA177 ±1.5nA
OPA131 50pA
OPA602 ±1pA
OPA128 ±75fA
FIGURE 8. Differential Voltage to Current Converter.
INA141
V
O
LA
RL
RA
10kΩ
Ref
G = 10
20kΩ 20kΩ
V
G
1/4
OPA4131
390kΩ
390kΩ
1/4
OPA4131
OPA4131
1/4
OPA4131
1/4
300Ω
+5V
2.5V – ∆V
2.5V + ∆V
+15V
–15V
INA141
V
O
Ref