View AMS9491_235066.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Advanced Monolithic Systems
FEATURES
* 10 mV max. initial tolerance (A grade) * Operating Current 10A to 20mA * Low Voltage Reference 1.235 * Max. 0.6 Dynamic Impedance (A grade) * Low Temperature Coefficient
AMS9491
1.235V VOLTAGE REFERENCE
APPLICATIONS
* Battery Powered Systems * Instrumentation * A/D, D/A Converters * Temperature measurement * Current sources * Pagers
GENERAL DESCRIPTION
The AMS9491 is a two-terminal micropower band-gap voltage reference diode. It feature a very low dynamic impedance and good temperature coefficient, operating over a 10A to 20mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS9491 is a band-gap reference, uses only transistors and resistors, low noise and good longterm stability result. Careful design of the AMS9491 has made the device 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 of the AMS9491 makes this reference diode useful for micropower circuitry. The AMS9491 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. The AMS9491 is operating over a 0C to 70C temperature range and is available in TO-92 and SO-8 packages.
ORDERING INFORMATION:
TOL. PACKAGE TYPE 8 LEAD SOIC AMS9491AS AMS9491BS OPERATING TEMPERATURE RANGE 0 to 70 C 0 to 70 C
TO-92 10mV AMS9491AN 20mV AMS9491BN
PIN CONNECTIONS
TO-92 Plastic Package (N) 8L SOIC SO Package (S)
+ 8 N/C N/C N/C 7 6 5
3
1
1
2
3
N/C N/C N/C
4 -
Bottom View
Top View
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS9491
ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current Forward Current Operating Temperature Range Storage temperature 30mA 10mA 0C to 70C -55C to +150C Soldering information TO-92 package: 10 sec. SOIC package: Vapor phase (60 sec) Infrared (15 sec.) 300C 215C 220C
ELECTRICAL CHARACTERISTICS
Parameter
Reverse Breakdown Voltage (Note 4) Reverse Dynamic Impedance (Note 4) Reverse Breakdown Voltage Change with current (Note 4) Min. Operating Current (Note 4) Wide Band Noise (Note 5) Temperature Coeff. (Note 6) Long Term Stability (Note 5) TA=25C.1C T = 1000 Hr IR - 100 A, 10Hz f 10kHz
Electrical Characteristics at IR = 100 A, and TA = +25C unless otherwise specified. Conditions
Min IR - 100 A 1.215
AMS9491A
Typ 1.235 0.2 Max 1.255 0.6 2.0 20 8 60 10 20 Min 1.215
AMS9491B
Typ 1.235 0.2 Max 1.255 0.6 2.0 20 8 60 10 20
Units
V mV A V
IR - 100 A, f =20Hz 10A IR 1mA 1mA IR 20mA
50
100
ppm/C
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: Thermal resistance is as follows: Thermal Resistance TO-92
170C/W (0.125" leads)
SO-8
165C/W
JA (junction to ambient)
Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25C. Note 4: Guaranteed and 100% production tested. Note 5: Guaranteed but not 100% production tested. These limits are not used to calculate average outgoing quality levels. Note 6: 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 0C, 25C, 70C.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS9491
TYPICAL APPLICATIONS
Wide Input Range Reference Micropower Reference from 9V Battery Reference from 1.5V Battery
VIN = 2.3V TO 30V
9V
1.5V
500k LM334 1.2V 4.3k AMS9491 OUT 1.24V AMS9491
3k 1.2V AMS9491
0C - 100C Thermometer
Lower Power Thermometer
0C - 100C Thermometer
*
150
M 1.3 TO 1.6V
150
0-100A M IOUT R1 4k R2 1k R AMS9491 R3 100 R4 220
LM334 AMS9491
8k TO 12k
0-50A IOUT
M R1 2k R2 1k R AMS9491 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 HFE 5 Select for operation at 1.3V IQ 600A to 900 A
Calibration 1. Short AMS9491, adjust R3 for IOUT = temp at 1A/K 2. Remove short, adjust R2 for correct reading in C IQ at 1.3V 500 A IQ at 1.6V 2.4mA
Calibration 1. Short AMS9491, adjust R3 for IOUT = temp at 1.8A/K 2. Remove short, adjust R2 for correct reading in F
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS9491
TYPICAL APPLICATIONS (Continued)
Centigrade Thermometer Micropower* 10V Reference
IQ VIN = 15V 2.2k V
+
LM334 V1.5V
R 2.3k
V1
V2
90k
25k
1M 2 + 7 LM4250C 3 8 4 22M 150pF 3.5M 6 10V
OUTPUT 1mV/ C
1.2k
27k
AMS9491
R1 1k AMS9491
500k
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 = 50A to 150A
*IQ 20A standby current
Micropower Thermocouple Cold Junction Compensator
V+
LM334 2k 1%
5.1k
1M 1% V-
R
Adjustment Procedure
TC ADJ 500
MERCURY + CELL 1.345V AMS9491
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 ( ) R2 Voltage Voltage ( ) Across R1 Across R2 @ 25C (mV) (mV) 1.24k 1k 953 150 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
523 432 408 63.4
Typical supply current 50A
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS9491
TYPICAL APPLICATIONS (Continued)
Precision 1 A to 1mA Current Sources
AMS9491 30V C1 150pF
AMS9491
R1 100k
2
R1 100k LM312 7 6 4 IOUT* 1.5V TO 27V -30V
C1 150pF 2 LM312 3 + 4 7 6
3 IOUT* -1.5V TO -27V
+
R2
R2
*IOUT =1.23V/R2
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS9491
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics OUTPUT VOLTAGE CHANGE (mV) 10 8 6 4 2 0 -2 0.01 0.1 1 10 REVERSE CURRENT (mA) 100
TA =25 C TA =-55 C
Reverse Characteristics 100 REVERSE CURRENT (A) FORWARD VOLTAGE (V) 1.2
Forward Characteristics
TA =125 C
TA =-55 C
10
T A =125 C TA =-55 C
0.8
1
TA =25 C
0.4
T A =25 C TA =125 C
0.1 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 REVERSE VOLTAGE (V) Temperature Drift of 3 Representative Units 1.260 DYNAMIC IMPEDANCE () REFERENCE VOLTAGE (V)
I R= 100 A
0 0.01 0.1 1 10 100 FORWARD CURRENT (mA)
Reverse Dynamic Impedance 100 DYNAMIC IMPEDANCE ()
Reverse Dynamic Impedance 10k 1k 100 10
T A =25 C I R= 100 A
1.250
10
TA =125 C
1.240
1
TA =-55 C
TA =25 C
1.230
1 0.1
1.220 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE ( C) Noise Voltage 700
0.1 0.01 0.1 1 10 REVERSE CURRENT (mA) 100
10
100
10k 100k 1k FREQUENCY (Hz)
1M
Filtered Output Noise 70
IR= 100 A
Response Time 2.0
IR= 100 A
INTEGRATED NOISE (V)
60 50 40 30 20 10 0 100
AMS9491 100A
VOLTAGE SWING (V)
SINGLE POLE LOW PASS
600 NOISE (nV/Hz) 500 400 300 200 100 0
1.5 1.0 0.5 0
OUTPUT INPUT 100k OUTPUT
OUTPUT
~ ~
INPUT
~ ~
10
SHARP CUTOFF FILTER
0 10 100 1k 10k FREQUENCY (Hz) 100k 0 200 400 TIME (s) 600
1k 10k 100k CUTOFF FREQUENCY (Hz)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS9491
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD TO-92 PLASTIC PACKAGE (N)
0.0600.005 (1.5240.127) DIA
0.1800.005 (4.5720.127) 0.0600.010 (1.5240.254) 0.1400.010 (3.5560.127)
0.1800.005 (4.5720.127)
0.90 (2.286) NOM
5 NOM 0.500 (12.70) MIN
10 NOM
0.050 (1.270) MAX
UNCONTROLLED LEAD DIMENSIONS
0.0500.005 (1.2700.127)
0.0160.003 (0.4060.076)
0.0150.002 (0.3810.051)
N (TO-92 ) AMS DRW# 042391
8 LEAD SOIC PLASTIC PACKAGE (S)
0.189-0.197* (4.801-5.004) 8 7 6 5
0.228-0.244 (5.791-6.197)
0.150-0.157** (3.810-3.988)
1
2
3
4
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 x 45 (0.254-0.508) 0-8 TYP
0.014-0.019 (0.355-0.483)
0.050 (1.270) TYP
0.016-0.050 (0.406-1.270)
S (SO-8 ) AMS DRW# 042293
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

▲Up To Search▲

Price & Availability of AMS9491

	To Download AMS9491 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .