AMS1004-1.2
PIN CONNECTIONS
TO-92
Plastic Package (N)
SO-8
SO Package (S)
+
8
N/C N/C N/C
7
6
5
SOT-89
(L)
3
2
1
3
1
2
3
N/C N/C N/C
4
-
N/C
2
+
1
-
Bottom View
Top View
Top View
TYPICAL APPLICATIONS
Wide Input
Range Reference
Micropower Reference
from 9V Battery
Reference from
1.5V Battery
V
IN
= 2.3V TO 30V
9V
1.5V
500k
LM334
1.2V
4.3k
AMS1004-1.2
OUT
1.24V
AMS1004-1.2
3k
1.2V
AMS1004-1.2
Micropower Thermocouple Cold Junction Compensator
V
+
LM334
2k
1%
5.1k
1M
1%
V
-
R
Adjustment Procedure
TC ADJ
500
MERCURY
+
CELL
1.345V
AMS1004-1.2
ZERO ADJ
100k
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
2. Adjust ZERO ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
Thermocouple
Type
Seebeck
Coefficient
(mV/
°
C)
52.3
42.8
40.8
6.4
R1
(Ω )
Ω
R2
Voltage
Voltage
(Ω ) Across R1
Ω
Across R2
@
25°C (mV)
°
(mV)
1.24k
1k
953Ω
150Ω
15.60
12.77
12.17
1.908
14.32
11.78
11.17
1.766
R2
R1
+
THERMOCOUPLE
+
-
-
COLD JUNCTION
ISO THERMAL
WITH LM334
METER
J
T
K
S
523
432
412
63.4
Typical supply current 50µA
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
