12
1
1N4148
VLIN
14
13
IR1
+12V
11
VI+N
IR2
10
V+
VREG
1µF
4
RG
B
E
9
8
RLIN1
5760Ω
RG
402Ω
Q1
0.01µF
16
10
XTR105
11
3
2
12
3
RG
VI–N
VO = 0 to 5V
15
14
IO
RCV420
2
7
13
IRET
5
4
Pt100
100°C to
600°C
IO = 4mA – 20mA
RZ
137Ω
6
RTD
1µF
–12V
RCM = 1kΩ
NOTE: A two-wire RTD connection is shown. For remotely
located RTDs, a three-wire RTD conection is recommended.
RG becomes 383Ω, RLIN2 is 8060Ω. See Figure 3 and
Table I.
0.01µF
FIGURE 7. ±12V Powered Transmitter/Receiver Loop.
12
RLIN1
RLIN2
1
1N4148
VLIN
14
13
IR1
11
VI+N
IR2
+15V
10
V+
VREG
1µF
1µF
Isolated Power
from PWS740
0
4
RG
–15V
9
8
B
E
Q1
0.01µF
16
RG
XTR105
10
11
3
2
12
3
2
RG
VI–N
V+
1
15
14
RCV420
IO
9
15
7
8
13
7
RZ
ISO122
VO
IRET
5
4
0 – 5V
10
IO = 4mA – 20mA
6
2
16
RTD
V–
NOTE: A three-wire RTD connection is shown.
For a two-wire RTD connection eliminate RLIN2
.
RCM = 1kΩ
0.01µF
FIGURE 8. Isolated Transmitter/Receiver Loop.
®
14
BB [ BURR-BROWN CORPORATION ]
