PIN CONNECTIONS
TO-92
Plastic Package (N)
SO-8
SO Package (S)
SOT-89
(L)
N/C N/C N/C
+
8
7
6
5
3
2
1
3
2
1
-
+
1
2
3
4
-
N/C
N/C N/C N/C
Bottom View
Top View
Top View
TYPICAL APPLICATIONS
Wide Input
Range Reference
Micropower Reference
from 9V Battery
Reference from
1.5V Battery
9V
1.5V
3k
VIN = 2.3V TO 30V
500k
LM334
1.2V
1.2V
4.3k
AMS1004-1.2
AMS1004-1.2
OUT
1.24V
AMS1004-1.2
Micropower Thermocouple Cold Junction Compensator
V+
LM334
2k
1%
5.1k
1M
1%
R
Adjustment Procedure
V-
TC ADJ
500
MERCURY
CELL
ZERO ADJ
100k
+
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
1.345V
2. Adjust ZERO ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
AMS1004-1.2
R2
R1
Thermocouple
Type
Seebeck
Coefficient
(mV/ °C)
R1
(Ω) (Ω) Across R1
@ 25°C (mV)
R2
Voltage
Voltage
Across R2
(mV)
+
-
+
-
THERMOCOUPLE
J
52.3
42.8
40.8
6.4
523 1.24k
432 1k
412 953Ω 12.17
63.4 150Ω 1.908
15.60
12.77
14.32
11.78
11.17
1.766
METER
T
K
S
COLD JUNCTION
ISO THERMAL
WITH LM334
Typical supply current 50µA
Advanced Monolithic Systems http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
