Datasheet

XTR108
23
SBOS187C
www.ti.com
FIGURE 10. Three-Wire RTD Connection with Multiple Minimum Temperature Capabilities.
FIGURE 11. Four-Wire RTD Connection.
Multiplexer
R
LINE3
R
LINE2
R
LINE1
21
3
RTD
R
21
R
22
R
23
R
24
R
25
R
CM
I
RET
0.01µF
Equal line resistances here create a
small common-mode voltage which is
rejected by the XTR108.
Resistance in this line causes a small
common-mode voltage which is rejected
by the XTR108.
Multiplexer
4
3
2
1
RTD
R
CM
0.01µF
OPA277
I
RET
V
S
R
LINE1
R
Z
R
LINE2
R
LINE3
R
LINE4