ADMOS AMS385

Advanced
Monolithic
Systems
AMS285/AMS385
ADJUSTABLE MICROPOWER VOLTAGE REFERENCE DIODE
FEATURES
APPLICATIONS
• Adjustable from 1.24V to 5.30V
• Operating Current 10µ
µ A to 20mA
• 1% and 2% Initial Tolerance
• 1Ω
Ω Dynamic Impedance
• Low Temperature Coefficient
• 1.2V Device and 2.5V Device also available
AMS285-1.2 and AMS285-2.5 series, respectively
AMS385-1.2 and AMS385-2.5 series.
• Battery Powered Systems
• Instrumentation
• A/D, D/A Converters
• Temperature measurement
• Current sources
• Notebook/Personal Computer
• Monitors/ VCR/ TV
• Pagers
GENERAL DESCRIPTION
The AMS285/AMS385 are three-terminal micropower band-gap voltage reference diodes. They feature a very low dynamic
impedance and good temperature coefficient, operating from 1.24V to 5.3V and over a 10µA to 20mA current range. On-chip
trimming is used to provide tight voltage tolerance. Since the AMS285/AMS385 is a band-gap reference, uses only transistors
and resistors, low noise and good long-term stability result. Careful design of the AMS285/AMS385 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
AMS285/AMS385 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.
The AMS285 is operational in the full industrial temperature range of -40°C to 85°C while AMS385 is operating over a 0°C
to 70°C temperature range. The AMS285/AMS385 are available in TO-92, SO-8 and SOT-89 packages.
ORDERING INFORMATION:
TOL.
±12mV
±25mV
±25mV
±12mV
±25mV
±25mV
PACKAGE TYPE
TO-92
AMS285AN
AMS285BN
AMS285CN
AMS385AN
AMS385BN
AMS385CN
8 LEAD SOIC
AMS285AS
AMS285BS
AMS285CS
AMS385AS
AMS385BS
AMS385CS
SOT-89
AMS285AL
AMS285BL
AMS285CL
AMS385AL
AMS385BL
AMS385CL
OPERATING
TEMPERATURE RANGE
-40 to 85° C
-40 to 85° C
-40 to 85° C
0 to 70° C
0 to 70° C
0 to 70° C
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
ABSOLUTE MAXIMUM RATINGS
Reverse Current
Forward Current
Operating Temperature Range
AMS285
AMS385
30mA
10mA
Storage temperature
Soldering information
TO-92 package: 10 sec.
SOIC package: Vapor phase (60 sec)
Infrared (15 sec.)
SOT-89 package: 10 sec.
-40°C to 85°C
0°C to 70°C
-55°C to +150°C
260°C
215°C
220°C
265°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
AMS285A
Typ
Max
AMS285B
Typ
AMS285C
Typ
Max
Parameter
Conditions
Reference Voltage
IR =100 µA
Dynamic Output
Impedance
IAC =0.1IR, f = 20Hz
VOUT = VREF
VOUT = 5.3V
Reference Voltage
Change with Current
10µA ≤IR ≤1mA
1mA ≤IR ≤20mA
0.2
4
1.0
10
0.2
4
1.0
10
0.2
4
1.0
10
mV
mV
Min. Operating
Current (Note 4)
VOUT = VREF
VOUT = 5.3V
6
30
9
45
6
30
9
45
6
30
9
45
µA
µA
Wide Band Noise
(Note 5)
10Hz ≤ f ≤ 10kHz
VOUT = VREF
VOUT = 5.3V
50
170
Min
1.228
1.240
1.215
0.3
0.7
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
1.252
Min
1.240
1.265
Min
1.215
0.3
0.7
1.265
100
20
Units
V
Ω
µVrms
50
170
50
20
1.240
0.3
0.7
50
170
25
TA=25°C±.1°C
Max
µVrms
150
20
ppm/°C
ppm
T = 1000 Hr
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
AMS285A
Typ
Max
AMS285B
Typ
AMS285C
Typ
Max
Parameter
Conditions
Reference Voltage
IR =100 µA
Dynamic Output
Impedance
IAC =0.1IR, f = 20Hz
VOUT = VREF
VOUT = 5.3V
Reference Voltage
Change with Current
10µA ≤IR ≤1mA
1mA ≤IR ≤20mA
0.2
4
1.0
10
0.2
4
1.0
10
0.2
4
1.0
10
mV
mV
Min. Operating
Current (Note 4)
VOUT = VREF
VOUT = 5.3V
6
30
9
45
6
30
9
45
6
30
9
45
µA
µA
Wide Band Noise
(Note 5)
10Hz ≤ f ≤ 10kHz
VOUT = VREF
VOUT = 5.3V
50
170
Min
1.228
1.240
0.3
0.7
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
1.252
Min
1.215
1.240
20
1.265
0.3
0.7
1.215
1.240
1.265
100
Units
V
Ω
µVrms
50
170
50
20
Min
0.3
0.7
50
170
25
TA=25°C±.1°C
Max
µVrms
150
20
T = 1000 Hr
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
ppm/°C
ppm
AMS285/AMS385
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: For elevated temperature operation, Tj max is:
AMS285
AMS385
+125°C
+100°C
Thermal Resistance
TO-92
ϕ JA (junction to ambient)
170°C/W (0.125” leads)
SO-8
SOT-89
165°C/W
160°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 and 85°C.
PIN CONNECTIONS
TO-92
Plastic Package (N)
FB
3
+
2
8L SOIC
SO Package (S)
+
8
1
1
N/C N/C ADJ
7
6
5
2
3
4
-
N/C N/C N/C
Bottom View
SOT-89
(L)
3
2
1
FB
+
-
Top View
Top View
5.0V Reference
Precision 10V Reference
TYPICAL APPLICATIONS
1.2V Reference
9V
9V
R1
50k
R1
500k
 R3

VOUT = 1.24 
+ 1
 R2

AMS385
-
R1
5k
VOUT
10V
5V
1.2V
+
15V
R2
120k
+
FB
AMS385
FB
AMS385
-
R3
364k
R2
301k
1%
+
-
FB
R3
68.1k
1%
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
TYPICAL APPLICATIONS (Continued)
Low AC Noise Reference
Current Source
+15V
15V
R1
100k
2N2905
FB
AMS385
+ C2
10µF
-
R4
33
FB
AMS385
R2
120k
+
R1
+
VOUT
10V
C1
0.47µF
2N3964
R2
120k
R3
360kΩ
1 µA< I < 100 mA
1.24V
IOUT =
R1
25V Low Current Shunt Regulator
200mA Shunt Regulator
V+
R3
V+
R4
100 µA< I < 5 mA
VOUT
25V
R1
+
120k
AMS385
50 µA< I < 200 mA
-
FB
AMS385
R2
2.4M
2N5115
R1
120k
+
FB
VOUT
2.5V
2N2219
R2
120k
R3
1k
Voltage Level Detector
R1
120k
+
AMS385
-
λ
D1
R3
200
-5V
Voltage Level Detector
FB
D1
R2
1M
R1
120k
+
λ
AMS385
-
R2
1M
R3
330
< -12V
LED ON
FB
> -12V
LED ON
-5V
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
TYPICAL APPLICATIONS (Continued)
Bidirectional Clamp
± 2.4V
Bidirectional Adjustable Clamp
± 1.8V to ± 2.4V
VIN
I
AMS385
VIN
R1
I
R2
510k
+
FB
D1
1N457
Bidirectional Adjustable Clamp
± 2.4V to ± 6V
FB
-
VOUT
D2
1N457
+
R1
I
R2
510k
AMS385
R3
510k
VIN
FB
-
AMS385
R3
510k
+
AMS385
VOUT
D2
1N457
D1
1N457
R4
390k
D1
1N457
+
D2
1N457
FB
R3
1M
-
FB
-
VOUT
R2
330k
AMS385
+
R1
AMS385
FB
R4
330k
+
AMS285 Typical Temperature Coefficient
0
∆Y
∆T
-5
-10
-50 -40 -25 0
25 50 75 80 100 125
TEMPERATURE (° C)
REFERENCE VOLTAGE CHANGE (mV)
REFERENCE VOLTAGE CHANGE (mV)
TYPICAL PERFORMANCE CHARACTERISTICS
AMS385 Typical Temperature Coefficient
0
∆Y
∆T
-5
TEMPCO =
-10
∆Y
∆T
0
25
70
TEMPERATURE (° C)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Reverse Characteristics
TA =125° C
6
4
TA =25° C
2
TA =-55° C
0
1.2
10
TA =125° C
1
TA =-55° C
0.1
1
10
REVERSE CURRENT (mA)
Temperature Drift of 3
Representative Units
TA =125° C
0.01
Feedback Current
1.250
1.240
1.230
1.220
20
15
VOUT = VREF
10
VOUT = 5.3V
5
10
70
AMS385
WORST
CASE
60
50
40
30
20
TYP @ 25° C
10
0
0
-50 -25 0
25 50 75 100 125
TEMPERATURE (° C)
Dynamic Output Impedance
1
Output Noise Voltage
100
1
Minimum Operating Current
IR= 100µA
-55 -35 -15 5 25 45 65 85 105 125
TEMPERATURE (° C)
0.1
80
MINIMUM CURRENT (µA)
IR= 100µA
FEEDBACK CURRENT (nA)
5
2
3
4
OUTPUT VOLTAGE (V)
Response Time
10,000
6
IR= 100µA
VOUT = VREF
5
OUTPUT
NOISE (nV/√Hz)
VOUT = 5.3V
10
VOUT = 5.3V
1
INPUT
4
VOLTAGE (V)
REFERENCE VOLTAGE (V)
TA =25° C
0.4
0.2 0.4 0.6 0.8 1.0 1.2 1.4
REVERSE VOLTAGE (V)
25
1.260
IR= 100µA
∆IR= 0.1IR
TA =25° C
0.8
0
0
100
TA =-55° C
TA =25° C
0.1
-2
FORWARD VOLTAGE (V)
8
0.01
OUTPUT IMPEDANCE (Ω)
Forward Characteristics
100
REVERSE CURRENT (µA)
OUTPUT VOLTAGE CHANGE (mV)
Reverse Characteristics
10
1,000
VOUT = VREF
100
50k
3
OUTPUT
120k
2
AMS385
1
364k
0
10
0.1
10
10
100
1k
10k
FREQUENCY (Hz)
100k
INPUT
0
10
100
1k
10k
FREQUENCY (Hz)
100k
0
50
100 150 200
TIME (µs)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285/AMS385
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)
5° NOM
0.500
(12.70)
MIN
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSIONS
0.015±0.002
(0.381±0.051)
0.016±0.003
(0.406±0.076)
0.050±0.005
(1.270±0.127)
10°
NOM
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
0.010-0.020
x 45°
(0.254-0.508)
0.053-0.069
(1.346-1.752)
0.004-0.010
(0.101-0.254)
0.014-0.019
(0.355-0.483)
0.008-0.010
(0.203-0.254)
0.050
(1.270)
TYP
0°-8° 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
AMS285/AMS385
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
SOT-89 PLASTIC PACKAGE (L)
0.173-0.181
(4.40-4.60)
0.055-0.063
(1.40-1.60)
0.014-0.017
(0.35-0.44)
0.064-0.072
(1.62-1.83)
0.155-0.167
(3.94-4.25)
0.084-0.090
(2.13-2.29)
0.090-0.102
(2.29-2.60)
0.035-0.047
(0.89-1.20)
0.059
(1.50)
BSC
0.014-0.019
(0.36-0.48)
0.017-0.022
(0.44-0.56)
L (SOT-89 ) AMS DRW# 042392
0.118
(3.00)
BSC
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140