AMS285-1.2/AMS385-1.2
TYPICAL APPLICATIONS (Continued)
Lower Power Thermometer
0°C - 100°C Thermometer
0°C - 100°C Thermometer
*
150
150
M
1.3 TO
1.6V‡
M
M
0-100mA
0-50mA
IOUT
8k TO
12k†
R1
4k
R1
2k
IOUT
LM334
AMS385-1.2
R2
1k
R2
1k
V+
V+
1.5V
(1.3-1.6V)†
1.3-1.6V
R
R
LM334
V-
LM334
V-
AMS385-1.2
AMS385-1.2
R3
100
R3
50
* 2N3638 or 2N2907 select for inverse HFE @ 5
† Select for operation at 1.3V
‡ IQ @ 600mA to 900 mA
R4
220
R4
100
Calibration
Calibration
1. Short AMS385-1.2, adjust R3 for IOUT = temp at
1mA/°K
1. Short AMS385-1.2, adjust R3 for IOUT = temp at
1.8mA/°K
2. Remove short, adjust R2 for correct reading in °C
† IQ at 1.3V @ 500 mA
2. Remove short, adjust R2 for correct reading in °F
IQ at 1.6V @ 2.4mA
Centigrade Thermometer
Micropower* 10V Reference
IQ
VIN = 15V
2.2k
V+
V1 V2
90k
25k
1M
2
R
LM334
V-
OUTPUT
1mV/° C
7
+
-
2.3k
1.5V†
6
LM4250C
10V
8
3
4
3.5M
150pF
AMS385-1.2
27k
22M
1.2k
R1
1k
500k
AMS385-1.2
*IQ @ 20mA standby current
Calibration
1. Adjust R1 so that V1 = temp at 1mV/°K.
2. Adjust V2 to 273.2mV.
† IQ for 1.3V to 1.6V battery voltage = 50mA to 150mA
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
