AMS9491 1.235V VOLTAGE REFERENCE APPLICATIONS Battery P
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max. initial tolerance grade) Operating Current 10µA 20mA Voltage Reference 1.235 Max. Dynamic Impedance grade) Temperature Coefficient
AMS9491
1.235V VOLTAGE REFERENCE
APPLICATIONS
Battery Powered Systems Instrumentation A/D, Converters Temperature measurement Current sources Pagers
GENERAL DESCRIPTION
AMS9491 two-terminal micropower band-gap voltage reference diode. feature very dynamic impedance good temperature coefficient, operating over 10µA 20mA current range. On-chip trimming used provide tight voltage tolerance. Since AMS9491 band-gap reference, uses only transistors resistors, noise good longterm stability result. Careful design AMS9491 made device exceptionally tolerant capacitive loading, making easy almost reference application. wide dynamic operating range allows with widely varying supplies with excellent regulation. extremely power drain AMS9491 makes this reference diode useful micropower circuitry. AMS9491 used make portable meters, regulators general purpose analog circuitry with battery life approaching shelf life. Further more, wide operating current allows replace older references with tight tolerance part. AMS9491 operating over 70°C temperature range available TO-92 SO-8 packages.
ORDERING INFORMATION:
TOL. PACKAGE TYPE LEAD SOIC AMS9491AS AMS9491BS OPERATING TEMPERATURE RANGE
TO-92 ±10mV AMS9491AN ±20mV AMS9491BN
CONNECTIONS
TO-92 Plastic Package SOIC Package
Bottom View
View
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS9491
ABSOLUTE MAXIMUM RATINGS (Note
Reverse Current Forward Current Operating Temperature Range Storage temperature 30mA 10mA 70°C -55°C +150°C Soldering information TO-92 package: sec. SOIC package: Vapor phase sec) Infrared sec.) 300°C 215°C 220°C
ELECTRICAL CHARACTERISTICS
Parameter
Reverse Breakdown Voltage (Note Reverse Dynamic Impedance (Note Reverse Breakdown Voltage Change with current (Note Min. Operating Current (Note Wide Band Noise (Note Temperature Coeff. (Note Long Term Stability (Note TA=25°C±.1°C 1000 10Hz 10kHz
Electrical Characteristics +25°C unless otherwise specified. Conditions
1.215
AMS9491A
1.235 1.255 1.215
AMS9491B
1.235 1.255
Units
=20Hz 10µA 20mA
ppm/°C
Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device intended functional, guarantee specific performance limits. guaranteed specifications test conditions, Electrical Characteristics. guaranteed specifications apply only test conditions listed. Note Thermal resistance follows: Thermal Resistance TO-92
170°C/W (0.125" leads)
SO-8
165°C/W
(junction ambient)
Note Parameters identified with boldface type apply temperature extremes. other numbers apply 25°C. Note Guaranteed 100% production tested. Note Guaranteed 100% production tested. These limits used calculate average outgoing quality levels. Note average temperature coefficient defined maximum deviation reference voltage measured temperatures between operating TMAX
TMIN, divided TMAX TMIN. measured temperatures 0°C, 25°C, 70°C.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS9491
TYPICAL APPLICATIONS
Wide Input Range Reference Micropower Reference from Battery Reference from 1.5V Battery
2.3V
1.5V
500k LM334 1.2V 4.3k AMS9491 1.24V AMS9491
1.2V AMS9491
100°C Thermometer
Lower Power Thermometer
100°C Thermometer
1.6V
0-100µA IOUT AMS9491
LM334 AMS9491
0-50µA IOUT
AMS9491
LM334
1.5V (1.3-1.6V)
LM334
1.3-1.6V
2N3638 2N2907 select inverse Select operation 1.3V 600µA
Calibration Short AMS9491, adjust IOUT temp 1µA/°K Remove short, adjust correct reading 1.3V 1.6V 2.4mA
Calibration Short AMS9491, adjust IOUT temp 1.8µA/°K Remove short, adjust correct reading
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS9491
TYPICAL APPLICATIONS (Continued)
Centigrade Thermometer Micropower* Reference
2.2k
LM334 V1.5V
2.3k
LM4250C 150pF 3.5M
OUTPUT 1mV/°
1.2k
AMS9491
AMS9491
500k
Calibration Adjust that temp 1mV/°K. Adjust 273.2mV. 1.3V 1.6V battery voltage 50µA 150µA
20µA standby current
Micropower Thermocouple Cold Junction Compensator
LM334
5.1k
Adjustment Procedure
MERCURY CELL 1.345V AMS9491
ZERO 100k
Adjust until voltage across equals Kelvin temperature multiplied thermocouple Seebeck coefficient. Adjust ZERO until voltage across equals thermocouple Seebeck coefficient multiplied 273.2. Thermocouple Type Seebeck Coefficient (mV/ 52.3 42.8 40.8 Voltage Voltage Across Across 25°C (mV) (mV) 1.24k 15.60 12.77 12.17 1.908 14.32 11.78 11.17 1.766
THERMOCOUPLE COLD JUNCTION THERMAL WITH LM334 METER
63.4
Typical supply current 50µA
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS9491
TYPICAL APPLICATIONS (Continued)
Precision Current Sources
AMS9491 150pF
AMS9491
100k
100k LM312 IOUT* 1.5V -30V
150pF LM312
IOUT* -1.5V -27V
*IOUT =1.23V/R2
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS9491
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics OUTPUT VOLTAGE CHANGE (mV) 0.01 REVERSE CURRENT (mA)
=25° =-55°
Reverse Characteristics REVERSE CURRENT (µA) FORWARD VOLTAGE
Forward Characteristics
=125°
=-55°
=125° =-55°
=25°
=25° =125°
REVERSE VOLTAGE Temperature Drift Representative Units 1.260 DYNAMIC IMPEDANCE REFERENCE VOLTAGE
0.01 FORWARD CURRENT (mA)
Reverse Dynamic Impedance DYNAMIC IMPEDANCE
Reverse Dynamic Impedance
=25°
1.250
=125°
1.240
=-55°
=25°
1.230
1.220 TEMPERATURE Noise Voltage
0.01 REVERSE CURRENT (mA)
100k FREQUENCY (Hz)
Filtered Output Noise
Response Time
INTEGRATED NOISE (µV)
AMS9491 100µA
VOLTAGE SWING
SINGLE POLE PASS
NOISE (nV/Hz)
OUTPUT INPUT 100k OUTPUT
OUTPUT
INPUT
SHARP CUTOFF FILTER
FREQUENCY (Hz) 100k TIME (µs)
100k CUTOFF FREQUENCY (Hz)
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS9491
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
LEAD TO-92 PLASTIC PACKAGE
0.060±0.005 (1.524±0.127)
0.180±0.005 (4.572±0.127) 0.060±0.010 (1.524±0.254) 0.140±0.010 (3.556±0.127)
0.180±0.005 (4.572±0.127)
0.90 (2.286)
0.500 (12.70)
0.050 (1.270)
UNCONTROLLED LEAD DIMENSIONS
0.050±0.005 (1.270±0.127)
0.016±0.003 (0.406±0.076)
0.015±0.002 (0.381±0.051)
(TO-92 DRW# 042391
LEAD SOIC PLASTIC PACKAGE
0.189-0.197* (4.801-5.004)
0.228-0.244 (5.791-6.197)
0.150-0.157** (3.810-3.988)
0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.008-0.010 (0.203-0.254)
0.010-0.020 (0.254-0.508) 0°-8°
0.014-0.019 (0.355-0.483)
0.050 (1.270)
0.016-0.050 (0.406-1.270)
(SO-8 DRW# 042293
*DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
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