Datasheet

8
LT1025
1025fb
TYPICAL APPLICATIO S
U
V
OUT
10mV/°C
0°C TO 500°C
R5
47k
R1
1k
1%
R7
15k
R3
141k
1%
R2
100Ω
R4
141k
C1
0.1µF
GND
LT1025
–15V
–
–
+
+
15V
6V
15V
–15V
R6
10k
TYPE E
1µF
*SEE “REVERSING THE POLARITY OF THE 10mV/°C OUTPUT”
††
OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS”
LTKA0x
††
–10mV/°C
V
IN
V
O
Utilizing Negative LT1025 Drive to Accommodate Grounded Thermocouple*
R6
7.5k
1%
R7
500
FULL-SCALE
TRIM
5V**
V
–
V
–
V
+
GND
V
IN
V
O
LT1025
R9
100k
R5
3k
–
+
TYPE K
†
–15V
–
+
LTKA0x
††
10mV/°C
V
OUT
V
CM
10mV/°C
C1*
C2*
R3
1M
0.1%
R1
10k
0.1%
R2
10k
0.1%
R4
1M
0.1%
R8
5k
1%
=
(V
–
)(10k)
V
OUT
(MAX)
*C1 AND C2 FILTER RIPPLE AND NOISE, BUT WILL LIMIT AC COMMON-MODE REJECTION
IF NOT MATCHED. SUGGESTED VALUES ARE 0.001µF TO 0.1µF
**USE LOWEST POSSIBLE SUPPLY VOLTAGE TO MINIMIZE INTERNAL TEMPERATURE RISE
†
FOR BEST ACCURACY, THERMOCOUPLE RESISTANCE SHOULD BE LESS THAN 100Ω
††
OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS”
Differential Thermocouple Amplifier