AMS9491BS [ADMOS]
1.235V VOLTAGE REFERENCE; 1.235V参考电压
| 型号： | AMS9491BS |
| 厂家： | 
ADVANCED MONOLITHIC SYSTEMS |
| 描述： | 1.235V VOLTAGE REFERENCE |
| 文件： | 总7页 (文件大小：78K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Advanced
Monolithic
Systems
AMS9491
1.235V VOLTAGE REFERENCE
FEATURES
APPLICATIONS
· ±10 mV max. initial tolerance (A grade)
· Operating Current 10mA to 20mA
· Low Voltage Reference 1.235
· Max. 0.6W Dynamic Impedance (A grade)
· Low Temperature Coefficient
· 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 10µA 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 long-
term 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 0°C to 70°C temperature range and is available in TO-92 and SO-8 packages.
ORDERING INFORMATION:
TOL.
PACKAGE TYPE
TO-92 8 LEAD SOIC
AMS9491AS
AMS9491BS
OPERATING
TEMPERATURE RANGE
±10mV AMS9491AN
±20mV AMS9491BN
0 to 70° C
0 to 70° C
PIN CONNECTIONS
TO-92
Plastic Package (N)
8L SOIC
SO Package (S)
N/C N/C N/C
+
8
7
6
5
3
1
1
2
3
4
-
N/C N/C N/C
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
30mA
Soldering information
Forward Current
Operating Temperature Range
Storage temperature
10mA
0°C to 70°C
-55°C to +150°C
TO-92 package: 10 sec.
SOIC package: Vapor phase (60 sec)
Infrared (15 sec.)
300°C
215°C
220°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 mA, and TA = +25°C unless otherwise specified.
Parameter
Conditions
AMS9491A
AMS9491B
Units
Min
Typ
Max
Min
Typ
Max
Reverse Breakdown Voltage
(Note 4)
IR - 100 µA
V
1.215
1.235
1.255
1.215
1.235
1.255
Reverse Dynamic Impedance
(Note 4)
0.2
0.6
0.2
0.6
W
IR - 100 µA, f =20Hz
Reverse Breakdown Voltage
Change with current (Note 4)
10mA £IR £1mA
1mA £IR £20mA
2.0
20
2.0
20
mV
Min. Operating Current (Note 4)
8
10
20
8
10
20
mA
mV
Wide Band Noise
(Note 5)
IR - 100 µA,
10Hz £ f £ 10kHz
60
60
Temperature Coeff.
(Note 6)
ppm/°C
ppm
50
100
Long Term Stability
(Note 5)
20
20
TA=25°C±.1°C
T = 1000 Hr
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
SO-8
j
JA (junction to ambient)
170°C/W (0.125” leads)
165°C/W
Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C.
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 0°C, 25°C, 70°C.
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
9V
1.5V
3k
VIN = 2.3V TO 30V
500k
LM334
1.2V
1.2V
4.3k
AMS9491
AMS9491
OUT
1.24V
AMS9491
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
AMS9491
R2
1k
R2
1k
V+
V+
1.5V
(1.3-1.6V)†
1.3-1.6V
R
R
LM334
V-
LM334
V-
AMS9491
AMS9491
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 AMS9491, adjust R3 for IOUT = temp at
1mA/°K
1. Short AMS9491, 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
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+
V1 V2
90k
25k
1M
R
LM334
V-
OUTPUT
1mV/° C
2
3
7
+
-
2.3k
1.5V†
6
LM4250C
10V
8
4
3.5M
150pF
AMS9491
27k
22M
1.2k
R1
1k
500k
AMS9491
*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
Micropower Thermocouple Cold Junction Compensator
V+
LM334
2k
1%
5.1k
1M
1%
R
Adjustment Procedure
V-
TC ADJ
500
MERCURY
CELL
ZERO ADJ
100k
+
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
1.345V
AMS9491
2. Adjust ZERO ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
R2
R1
Thermocouple
Type
Seebeck
Coefficient
(mV/ °C)
R1
R2
Voltage
Voltage
Across R2
(mV)
(W) (W) Across R1
@ 25°C (mV)
+
-
+
J
52.3
42.8
40.8
6.4
523 1.24k
432 1k
408 953W 12.17
63.4 150W 1.908
15.60
12.77
14.32
11.78
11.17
1.766
THERMOCOUPLE
METER
-
T
K
S
COLD JUNCTION
ISO THERMAL
WITH LM334
Typical supply current 50mA
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS9491
TYPICAL APPLICATIONS (Continued)
Precision 1mA to 1mA Current Sources
AMS9491
AMS9491
30V
C1
150pF
C1
150pF
R1
100k
R1
100k
2
-
2
3
-
7
7
6
6
LM312
LM312
4
4
3
+
+
IOUT*
IOUT*
R2
R2
-1.5V TO -27V
1.5V TO 27V
-30V
*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
Reverse Characteristics
Forward Characteristics
100
10
10
8
1.2
T
=-55° C
A
T
=125° C
A
6
4
0.8
0.4
T
=125° C
T =-55° C
A
A
T
=25° C
A
T
=25° C
A
2
T
=125° C
1
A
T
=-55° C
A
T
=25° C
0
A
0.1
-2
0
0
0.2
0.8 1.0 1.2
1.4
0.01
0.1
1
10
100
0.4 0.6
0.01
0.1
1
10
100
REVERSE VOLTAGE (V)
FORWARD CURRENT (mA)
REVERSE CURRENT (mA)
Temperature Drift of 3
Representative Units
Reverse Dynamic Impedance
Reverse Dynamic Impedance
10k
1k
1.260
1.250
100
10
T
I
=25° C
A
I
= 100mA
R
= 100mA
R
T
=125° C
A
100
10
1.240
1.230
1.220
1
T
=25° C
A
1
T
=-55° C
A
0.1
0.1
-35 -15
-55
10
5
65 85 105
100
10k
100k
0.01
0.1
1
10
100
25 45
125
1k
1M
FREQUENCY (Hz)
REVERSE CURRENT (mA)
TEMPERATURE (° C)
Noise Voltage
Filtered Output Noise
Response Time
70
60
50
40
30
20
10
0
700
2.0
1.5
I
= 100mA
I
= 100mA
R
R
OUTPUT
INPUT
600
500
400
300
SINGLE POLE LOW PASS
1.0
0.5
0
100mA
OUTPUT
100k
OUTPUT
AMS9491
~
~
~
~
200
100
0
10
0
INPUT
SHARP CUTOFF
FILTER
100
1k
10k
100k
10
100
1k
10k
100k
0
200
400
600
CUTOFF FREQUENCY (Hz)
FREQUENCY (Hz)
TIME (ms)
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)
0.180±0.005
(4.572±0.127)
0.060±0.005
(1.524±0.127)
DIA
0.060±0.010
(1.524±0.254)
0.90
(2.286)
NOM
0.180±0.005
(4.572±0.127)
0.140±0.010
(3.556±0.127)
10°
NOM
5° NOM
0.500
(12.70)
MIN
UNCONTROLLED
LEAD DIMENSIONS
0.050
(1.270)
MAX
0.015±0.002
N (TO-92 ) AMS DRW# 042391
(0.381±0.051)
0.016±0.003
(0.406±0.076)
0.050±0.005
(1.270±0.127)
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
0.010-0.020
(0.254-0.508)
x 45°
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°-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
相关型号：
©2020 ICPDF网 联系我们和版权申明