Datasheet
INA326, INA327
17
SBOS222D
www.ti.com
FIGURE 18. Single-Supply PID Temperature Control Loop.
V
S
V−
V+
V−
V+
R
19
100kΩ
R
20
5k‰
POT
R
17
5kΩ
POT
R
2
100kΩ
R
DIFF
1MΩ
Differentiator
TC: 100ms to 1s
R
1
100kΩ
C
8
0.1µF
R
25
10kΩ
R
22
10kΩ
R
23
10kΩ
R
21
10kΩ
Proportional
Error Amplifier
Bias Generator
Loop Gain
Adjust
Set Temp
Gain = 100V/V
Integrator
TC: 1s to 10s
1/4
OPA4340
1/4
OPA4340
1/2
OPA2340
1/4
OPA4340
1/4
OPA4340
C
INT
1µF
R
INT
10MΩ
R
18
10kΩ
R
15
200Ω
R
16
2kΩ
POT
C
3
1nF
V
BIAS
V
BIAS
V
BIAS
V
S
V
S
V
BIAS
Common
Output to
TEC
Driver
Common
+5V Input
V
BIAS
V
BIAS
C
DIFF
1µF
Summing Amplifier
INA326
V
O
6
R
14
10kΩ
R
13
20Ω
R
10
1kΩ
C
7
22nF
R
8
100kΩ
R
9
2kΩ
R
7
1kΩ
POT
R
11
14.3kΩ
R
12
15kΩ
R
THERM
10k‰
R
6
9.53kΩ
C
5
1nF
R
5
20kΩ
R
4
20kΩ
C
2
470nF
C
6
10µF
REF1004- 2.5
D
1
7
V+
4
0.1µF
V−
5
8
8
4
1
IN+
IN−
3
2
+
C
4
10 F
+
1/2
OPA2340
V
S
V
S
C
1
1nF
V
BIAS