Datasheet

16
®
XTR112, XTR114
FIGURE 9. Bridge Input, Current Excitation.
4
3
2
R
G
XTR112
XTR114
7
6
R
G
R
G
V+
10
13
B
E
9
8
V
IN
–
V
IN
+
I
RET
R
CM
(1)
200µA (XTR114)
500µA (XTR112)
NOTE: (1) Use R
CM
to adjust the
common-mode voltage to within
1.25V to 3.5V.
14
1
12
11
V
REG
I
R2
I
R1
V
LIN
FIGURE 8. Isolated Transmitter/Receiver Loop.
5
4
2
3
15
13
14
11
10
12
RCV420
16
16
2
15
10
8
7
9
V–
V
O
V+
0 – 5V
ISO124
1
+15V
0
–15V
1µF
1µF
Isolated Power
from PWS740
0.01µFQ
1
1N4148
8
7
9
E
B
14
11
12
13
4
3
2
XTR112
XTR114
R
CM
1
0.01µF
R
LIN1
R
G
R
LIN2
RTD
6
R
G
R
G
V
LIN
I
R1
I
R2
V
REG
V+
I
RET
I
O
10
I
O
= 4mA – 20mA
V
IN
–
V
IN
+
R
Z
NOTE: A three-wire RTD connection is shown.
For a two-wire RTD connection, eliminate R
LIN2
.