The AMS3100-1.2 are two-terminal micropower band-gap voltage reference that feature a very low dynamic impedance and
good temperature coefficient, operating over a 10µA to 20mA current range. AMS3100-1.2 is trimmed at wafer test level to
optimize the temperature coefficient and tight output voltage tolerance. The advanced process technology used, makes the
AMS3100-1.2 exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application. The
wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power
drain, makes these reference diodes useful for micropower circuitry. These voltage references can be used to make portable
meters, regulators or general purpose analog circuitry with battery life approaching shelf life. Further more, the wide
operating current allows it to replace older references with a tight tolerance part. Pin to pin compatible with other standard
industry references, the AMS3100-1.2 offers the advantage of long term stability at low cost.
The AMS3100-1.2 is operating over a -40°C to 85°C temperature range and is available in the space saving SOT-23
package.
ORDERING INFORMATION
:
TOL.
PACKAGE TYPE
OPERATING
TEMPERATURE RANGE
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
SOT-23
±6mV
AMS3100-1.2AM
±12mV
AMS3100-1.2BM
±25mV
AMS3100-1.2CM
PIN CONNECTIONS
3L SOT-23
(M)
3 *
1
+
2
-
*This pin must be left floating or
connected to pin 2
Top View
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS3100-1.2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Reverse Current
Forward Current
Operating Temperature Range
Storage temperature
30mA
10mA
-40°C to 85°C
-55°C to +150°C
Lead Temperature
Vapor phase (60 sec)
Infrared (15 sec.)
Thermal Resistance (θ
JA
)
215°C
220°C
410°C/W
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
R
= 100
µA,
and T
A
= +25°C unless otherwise specified.
Parameter
Reverse Breakdown
Voltage (Note 3)
Reverse Dynamic
Impedance (Note 4)
Reverse Breakdown
Voltage Change with
current (Note 3)
Min. Operating
Current (Note 3)
Wide Band Noise
(Note 4)
Temperature Coeff.
(Note 5)
Long Term Stability
(Note 4)
T
A
=25°C±.1°C
T = 1000 Hr
I
R
- 100
µA,
10Hz
≤
f
≤
10kHz
Conditions
I
R
- 100
µA
I
R
- 100
µA,
f =20Hz
10µA
≤I
R
≤1mA
1mA
≤I
R
≤20mA
AMS3100A-1.2
Min
Typ
Max
1.229
1.235
0.2
1.0
5
5
10
15
1.241
0.50
AMS3100B-1.2
Min
Typ
Max
1.223
1.235
0.5
1.0
5
5
10
15
1.249
AMS3100C-1.2
Min
Typ
Max
1.210
1.235
0.5
1.0
5
5
10
15
1.260
Units
V
Ω
mV
µA
µA
µV
60
60
60
25
50
40
100
75
ppm/°C
20
20
20
ppm
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics
.
The
guaranteed specifications apply only for the test conditions listed.
Note 2:
Parameters identified with
boldface type
apply at temperature extremes. All other numbers apply at T
A
= T
J
= 25°C.
Note 3:
Guaranteed and 100% production tested.
Note 4:
Guaranteed but not 100% production tested. These limits are not used to calculate average outgoing quality levels.
Note 5:
The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating T
MAX and
T
MIN
, divided by T
MAX
- T
MIN
. The measured temperatures are 0°C, 25°C, 85°C.
TYPICAL APPLICATIONS
Wide Input
Range Reference
Micropower Reference
from 9V Battery
9V
Reference from
1.5V Battery
1.5V
V
IN
= 2.3V TO 30V
500k
LM334
1.2V
4.3k
AMS3100-1.2
OUT
1.24V
AMS3100-1.2
3k
1.2V
AMS3100-1.2
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS3100-1.2
TYPICAL APPLICATIONS
(Continued)
0°C - 100°C Thermometer
°
°
Lower Power Thermometer
0°C - 100°C Thermometer
°
°
*
150
M
1.3 TO
1.6V‡
150
0-100µA M
I
OUT
R1
4k
R2
1k
R
AMS3100-1.2
R3
100
R4
220
LM334
AMS3100-1.2
8k TO
12k†
0-50µA M
I
OUT
R1
2k
R2
1k
R
AMS3100-1.2
R3
50
R4
100
V
+
LM334
V
-
1.5V
(1.3-1.6V)†
V
+
LM334
V
-
1.3-1.6V
* 2N3638 or 2N2907 select for inverse H
FE
≅
5
†
Select for operation at 1.3V
‡
I
Q
≅
600µA to 900
µA
Calibration
Calibration
1. Short AMS3100-1.2, adjust R3 for I
OUT
= temp at
1µA/°K
2. Remove short, adjust R2 for correct reading in
°C
†
I
Q
at 1.3V
≅
500
µA
I
Q
at 1.6V
≅
2.4mA
1. Short AMS3100-1.2, adjust R3 for I
OUT
= temp at
1.8µA/°K
2. Remove short, adjust R2 for correct reading in
°F
Centigrade Thermometer
Micropower* 10V Reference
I
Q
V
IN
= 15V
2.2k
V
+
LM334
V
-
1.5V†
R
V1
V2
90k
25k
1M
2
+
7
LM4250C
3
1.2k
27k
AMS3100-1.2
8
-
4
22M
150pF
3.5M
6
10V
OUTPUT
1mV/° C
2.3k
R1
1k
AMS3100-1.2
500k
Calibration
1. Adjust R1 so that V1 = temp at 1mV/°K.
2. Adjust V2 to 273.2mV.
†
I
Q
for 1.3V to 1.6V battery voltage = 50µA to 150µA
*I
Q
≅
20µA standby current
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS3100-1.2
TYPICAL APPLICATIONS
(Continued)
Micropower Thermocouple Cold Junction Compensator
V
+
LM334
2k
1%
5.1k
1M
1%
V
-
MERCURY
+
CELL
1.345V
ZERO
ADJ 100k
AMS3100-1.2
R
Adjustment Procedure
TC ADJ
500
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
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