Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced AMS3100-1.2
Monolithic MICROPOWER VOLTAGE REFERENCE
Systems
FEATURES APPLICATIONS
•• ±6 mV (±0.5%) max. initial tolerance (A grade) •• Battery Powered Systems
•• Operating Current 10µµA to 20mA •• Instrumentation
•• Low Voltage Reference 1.240 •• A/D, D/A Converters
•• Max. 0.5ΩΩ Dynamic Impedance (A grade) •• Temperature measurement
•• Low Temperature Coefficient •• Current sources
•• SOT-23 Package Available •• Notebook/Personal Computer
•• Low cost •• Monitors/ VCR/ TV
•• Pagers
GENERAL DESCRIPTION
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
SOT-23 TEMPERATURE RANGE
±6mV AMS3100-1.2AM -40°C to 85°C
±12mV AMS3100-1.2BM -40°C to 85°C
±25mV AMS3100-1.2CM -40°C to 85°C
PIN CONNECTIONS 3L SOT-23
(M)
+-
3 *
21
Top View
*This pin must be left floating or
connected to pin 2
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS3100-1.2
ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current 30mA Lead Temperature
Forward Current 10mA Vapor phase (60 sec) 215°C
Operating Temperature Range -40°C to 85°C Infrared (15 sec.) 220°C
Storage temperature -55°C to +150°CThermal Resistance (θJA)410°C/W
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
Parameter Conditions AMS3100A-1.2
Min Typ Max AMS3100B-1.2
Min Typ Max AMS3100C-1.2
Min Typ Max Units
Reverse Breakdown
Voltage (Note 3) IR - 100 µA1.229 1.235 1.241 1.223 1.235 1.249 1.210 1.235 1.260 V
Reverse Dynamic
Impedance (Note 4) IR - 100 µA, f =20Hz 0.2 0.50 0.5 0.5 Ω
Reverse Breakdown
Voltage Change with
current (Note 3)
10µA ≤IR ≤1mA
1mA ≤IR ≤20mA
1.0
51.0
51.0
5mV
Min. Operating
Current (Note 3) 5 10
15 5 10
15 5 10
15 µA
µA
Wide Band Noise
(Note 4)
IR - 100 µA,
10Hz ≤ f ≤ 10kHz 60 60 60 µV
Temperature Coeff.
(Note 5) 25 50 40 100 75 ppm/°C
Long Term Stability
(Note 4) TA=25°C±.1°C
T = 1000 Hr 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 TA = TJ = 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 TMAX and
TMIN, divided by TMAX - TMIN. The measured temperatures are 0°C, 25°C, 85°C.
TYPICAL APPLICATIONS
Wide Input Micropower Reference Reference from
Range Reference from 9V Battery 1.5V Battery
4.3k
LM334
OUT
1.24V
AMS3100-1.2
V
IN
= 2.3V TO 30V
AMS3100-1.2
1.2V
500k
9V
AMS3100-1.2
1.2V
3k
1.5V
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS3100-1.2
TYPICAL APPLICATIONS (Continued)
0°°C - 100°°C Thermometer Lower Power Thermometer 0°°C - 100°°C Thermometer
AMS3100-1.2
150
R1
4k
R2
1k
R3
100
R4
220
1.5V
(1.3-1.6V)†
R
V-
V+
LM334
M
0-100
µ
A
IOUT
Calibration
1. Short AMS3100-1.2, adjust R3 for IOUT = temp at
1µA/°K
2. Remove short, adjust R2 for correct reading in °C
† IQ at 1.3V ≅ 500 µA
IQ at 1.6V ≅ 2.4mA
LM334
M
AMS3100-1.2
1.3 TO
1.6V‡
*
8k TO
12k†
* 2N3638 or 2N2907 select for inverse HFE ≅ 5
† Select for operation at 1.3V
‡ IQ ≅ 600µA to 900 µA
AMS3100-1.2
150
R1
2k
R2
1k
R3
50
R4
100
1.3-1.6V
R
V-
V+
LM334
M
0-50
µ
A
IOUT
Calibration
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
AMS3100-1.2
V+
V-
R
R1
1k
V1 V2
LM334 90k 25k
27k
1.2k
2.3k
OUTPUT
1mV/° C
2.2k
1.5V†
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 = 50µA to 150µA
150pF
AMS3100-1.2
3.5M
500k
22M
1M
7
4
6
3
2
-
+
VIN = 15V
IQ
10VLM4250C 8
*IQ ≅ 20µA standby current
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS3100-1.2
TYPICAL APPLICATIONS (Continued)
Micropower Thermocouple Cold Junction Compensator
+
LM334
AMS3100-1.2
R1
R2
ZERO
ADJ 100k
1M
1%
5.1k 2k
1%
TC ADJ
500
METER
MERCURY
CELL
1.345V
+
-
V+
V-
R
THERMOCOUPLE +
-
COLD JUNCTION
ISO THERMAL
WITH LM334
Adjustment Procedure
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 Seebeck R1 R2 Voltage Voltage
Type Coefficient (ΩΩ) (ΩΩ) Across R1 Across R2
(mV/ °°C) @ 25°°C (mV) (mV)
J 52.3 523 1.24k 15.60 14.32
T 42.8 432 1k 12.77 11.78
K 40.8 408 953Ω 12.17 11.17
S 6.4 63.4 150Ω 1.908 1.766
Typical supply current 50µA
Precision 1µµA to 1mA Current Sources
7
4
3
2
+
-
LM312 6
AMS3100-1.2
R2
R1
100k
-30V
-1.5V TO -27V
C1
150pF
IOUT*
*IOUT =1.23V/R2
7
4
3
2
+
-
LM312 6
R2
R1
100k
30V
1.5V TO 27V
C1
150pF
IOUT*
AMS3100-1.2
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS3100-1.2
TYPICAL PERFORMANCE CHARACTERISTICS
-2
2
4
8
10
0.1 1 10 100
Reverse Characteristics
0
6
OUTPUT VOLTAGE CHANGE (mV)
T
A
=25° C
0.1
100
0.1 1 10 100
Reverse Dynamic Impedance
1
10
DYNAMIC IMPEDANCE (
Ω
)
0.01 0
0.4
1.2
0.1 1 10 100
0.8
0.01
REVERSE CURRENT (mA)
REVERSE CURRENT (mA)
00.2 0.4 0.6 0.8 1.0 1.2
0.1
100
10
1.4
REVERSE VOLTAGE (V)
REVERSE CURRENT (
µ
A)
1
Reverse Characteristics Forward Characteristics
FORWARD CURRENT (mA)
FORWARD VOLTAGE (V)
10 100 1k 10k 100k
0.1
1k
10
Reverse Dynamic Impedance
1M
FREQUENCY (Hz)
DYNAMIC IMPEDANCE (
Ω
)
1
10k
100
-55 525 45 65 85 105
1.260
1.240
125
REFERENCE VOLTAGE (V)
Temperature Drift of 3
Representative Units
0
10
0
1.0
2.0
0 200 400 600
TIME (
µ
s)
Response Time
VOLTAGE SWING (V)
0.5
1.5
~
~
~
~
0
200
400
600
700
100 1k 10k 100k
Noise Voltage
100
500
NOISE (nV/
√
Hz)
I
R
= 100
µ
A
10 FREQUENCY (Hz)
300
100 1k 10k 100k
CUTOFF FREQUENCY (Hz)
INTEGRATED NOISE (
µ
V)
0
10
20
30
40
50
60
70
TEMPERATURE (° C)
1.250
1.230
1.220
-35 -15
I
R
= 100
µ
A
T
A
=70° C
T
A
=70° C
T
A
=25° C
T
A
=25° C T
A
=70° C
T
A
=25° C
I
R
= 100
µ
A
T
A
=25° C
T
A
=70° C
I
R
= 100
µ
A
100
µ
AOUTPUT
AMS3100-1.2
OUTPUT
100k
INPUT
OUTPUT
INPUT
SINGLE POLE LOW PASS
SHARP CUTOFF
FILTER
Filtered Output Noise
0.01
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS3100-1.2
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD SOT-23 PLASTIC PACKAGE (M)
0.047-0.055
(1.194-1.397)
0.015-0.017
(0.381-0.432)
0.110-0.120
(2.794-3.048)
0.083-0.098
(2.108-2.489)
0.035-0.040
(0.889-1.016)
0.070-0.080
(1.778-2.032) 0.018-0.024
(0.457-0.610)
10°
NOM
0.0034-0.0050
(0.086-0.127)
(SOT-23 ) AMS DRW# 051991
0.035-0.041
(0.089-1.041)
0.0005-0.0040
(0.013-0.102)
0.018-0.024
(0.457-0.610)
10°
NOM
