Datasheet

LTC2997
12
2997fa
TYPICAL APPLICATIONS
Figure 10. Long Distance Remote Temperature Sensor
Figure 9. Output Noise Filter
2.5V TO 5.5V
D
+
D
–
LTC2997
2997 F09
V
CC
V
PTAT
V
PTAT(FILTER)
>1k
GND
0.1µF
C
FILTER
RC TIME CONSTANT (ms)
0.005
0
V
PTAT
NOISE (°C RMS)
0.05
0.15
0.20
0.10
0.5
50
0.25
0.30
0.05
5
Figure 8. Single Wire Remote Temperature Sensor
V
REF
2.5V TO 5.5V
D
+
D
–
LTC2997
470pF
2N3904
2997 F08
V
CC
V
PTAT
GND
0.1µF
4mV/K
1.8V
V
REF
2.5V TO 5.5V
D
+
D
–
LTC2997
CAT6 STP CABLE
10m MAXIMUM
470pF
MMBT
3904
2997 F10
V
CC
V
PTAT
GND
0.1µF
4mV/K
1.8V