http://www.BDTIC.com/AMS
Advanced AMS285-2.5/AMS385-2.5
Monolithic MICROPOWER VOLTAGE REFERENCE DIODE
Systems
RoHS compliant
FEATURES APPLICATIONS
• ±20 mV (±0.8%) max. in
• Operating Current 20µA to 20mA • Instrumentation
• Low Voltage Reference 2.5V • A/D, D/A Converters
• Max. 0.6Ω Dynamic Impedance (A grade) • Temperature measurement
• Low Temperature Coefficient • Current sources
• 1.2V Devi
AMS285-1.2 and AMS285 seri
AMS385-1.2 and AMS385 series.
GENERAL DESCRIPTION
The AMS285-2.5/AMS385-2.5 are two-terminal micropower band-gap voltage reference diodes. They feature a very low
dynamic i
used to provide tight voltage tolerance. Since the AMS285-2.5/AMS385-2.5 is a band-gap reference, uses only transistors and
resistors, low noise and good long term stability result. Careful design of the AMS285-2.5/AMS385-2.5 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
AMS285-2.5/AMS385-2.5 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 AMS285-2.5 is operational in the full industrial temperature range of -40°C to
a 0°C to 70°C temperature range. The AMS285-2.5/AMS385-2.5 are available in TO-92, SO-8 and SOT-89 packages.
ORDERING INFORMATION:
TOL. PACKAGE TYPE OPERATING
±20mV AMS285-2.5AN AMS285-2.5AS AMS285-2.5AL
±38mV AMS285-2.5BN AMS285-2.5BS AMS285-2.5BL
±75mV AMS285-2.5CN AMS285-2.5CS AMS285-2.5CL
±20mV AMS385-2.5AN AMS385-2.5AS AMS385-2.5AL
±38mV AMS385-2.5BN AMS385-2.5BS AMS385-2.5BL
±75mV AMS385-2.5CN AMS385-2.5CS AMS385-2.5CL
ce and Adjustable Device also available • Notebook/Personal Computer
mpedance and good temperature coefficient, operating over a 20µA to 20mA current range. On-chip trimming is
TO-92 8 LEAD SOIC SOT-89
itial tolerance (A grade) • Battery Powered Systems
es, respectively
• Monitors/ VCR/ TV
• Pagers
85°C whi
TEMPERATURE RANGE
le AMS385-2.5 is operating over
-40 to 85° C
-40 to 85° C
-40 to 85° C
0 to 70° C
0 to 70° C
0 to 70° C
AMS285-2.5/AMS385-2.5
http://www.BDTIC.com/AMS
ABSOLUTE MAXIMUM RATINGS
Reverse Current 30mA Storage temperature
Forward Current
10mA Soldering information (25 sec)
Operating Temperature Range
AMS285-2.5
AMS385-2.5
-40°C to
0°C to
85°C
70°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
Parameter
Reverse Breakdown
Voltage (Note 4)
Reverse Dynamic
Impedance (Note 4)
Reverse Breakdown
Voltage Change with
current (Note 4)
Min. Operating
Current (Note 4)
Conditions
- 100 µA
I
R
- 100 µA, f =20Hz
I
R
10µA ≤I
1mA ≤I
≤1mA
R
≤20mA
R
AMS285A-2.5
Min Typ Max
2.480 2.500 2.520 2.462 2.500
0.2 0.60 1 1
1.0
10
12 18
20
AMS285B-2.5
Min Typ Max
2.538 2.425 2.500 2.575
1.0
10
13 20
30
-55°C to +150°C
265°C
AMS285C-2.5
Min Typ Max
2.0
13 20
20
30
Units
V
Ω
mV
µA
µA
Wide Band Noise
(Note 5)
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
IR - 100 µA,
10Hz ≤ f ≤ 10kHz
=25°C±.1°C
T
A
T = 1000 Hr
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
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)
Conditions
- 100 µA
I
R
- 100 µA, f =20Hz
I
R
10µA ≤I
1mA ≤I
IR - 100 µA,
10Hz ≤ f ≤ 10kHz
= 100 µA, and TA = +25°C unless otherwise specified.
R
Min Typ Max
2.480 2.500 2.520 2.462 2.500 2.538 2.425 2.500 2.575
≤1mA
R
≤20mA
R
120 120 120
25
20 20 20 ppm
AMS385A-2.5
AMS385B-2.5
50
Min Typ Max
0.2 0.60 1 1
1.0
10
12 18
120 120 120
20
2.0
13 20
AMS385C-2.5
Min Typ Max
2.0
20
13 20
30
100 150
20
30
µV
ppm/°C
Units
V
Ω
mV
µA
µA
µV
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
T
=25°C±.1°C
A
T = 1000 Hr
25
20 20 20 ppm
50
100 150
ppm/°C
AMS285-2.5/AMS385-2.5
http://www.BDTIC.com/AMS
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
Note 2: For elevated temperature operation, T
AMS285 +125°C
AMS385 +100°C
ϕ
Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
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
T
MAX and TMIN
PIN CONNECTIONS
. The guaranteed specifications apply only for the test conditions listed.
max is:
j
Thermal Resistance TO-92 SO-8 SOT-89
(junction to ambient)
JA
, divided by T
170°C/W (0.125” leads) 165°C/W 160°C/W
- T
MAX
. The measured temperatures are 0°C, 25°C, 70°C and 85°C.
MIN
= TJ = 25°C.
A
TO-92 8L SOIC SOT-89
Plastic Package (N) SO Package (S) (L)
123
N/C N/CN/C
+
756
12843
N/C N/C N/C
-
N/C
123
-+
Bottom View Top View Top View
TYPICAL APPLICATIONS
Wide Input Micropower Reference
Range Reference from 9V Battery
V
= 3.7V TO 30V
IN
LM334
AMS385-2.5
3.3k
OUT
2.5V
9V
200k
AMS385-2.5
2.5V
http://www.BDTIC.com/AMS
TYPICAL APPLICATIONS (Continued)
0°C - 100°C Thermometer
AMS285-2.5/AMS385-2.5
0°C - 100°C Thermometer
1k
M
0-100
µ
A
I
OUT
LM334
+
V
-
V
R1
8k
R2
1k
R
R3
100
R4
220
AMS385-2.5
Calibration
1. Short AMS385-2.5, adjust R3 for I
= temp at 1µA/°K
OUT
2. Remove short, adjust R2 for correct reading in °C
Micropower* 5V Regulator Micropower* 10V Reference
+
V
+
LM4250C
4
7
8
47k
6
1N457
1N457
10M
150pF
2k 100k
LM334
AMS385-2.5
R
-
2.2k
V
3
2
*IQ ≅ 40µA
2N2905
100k
3V
I
Q
+
≥ 5.2V
V
IN
VO = 5V
≤ 100mA
I
L
4.7
µ
F
TANTALUM
150
M
0-50
µ
A
I
OUT
LM334
+
V
-
V
R1
4k
R2
1k
R
R3
50
R4
100
AMS385-2.5
Calibration
1. Short AMS385-2.5, adjust R3 for I
= temp at 1.8µA/°K
OUT
2. Remove short, adjust R2 for correct reading in °F
I
Q
V
= 15V
IN
500k
2
7
+
6
8
4
22M
150pF
AMS385-2.5
3
-
*I
≅ 20µA standby current
Q
3V
10VLM4250C
1.5M
500k
http://www.BDTIC.com/AMS
TYPICAL APPLICATIONS (Continued)
Micropower Thermocouple Cold Junction Compensator
+
LM334
V
18k
1M
1%
-
V
LITHIUM
THERMOCOUPLE
+
3V
AMS385-2.5
+
-
COLD JUNCTION
ZERO ADJ
100k
R2
ISO THERMAL
WITH LM334
R1
+
METER
-
AMS385-2.5
AMS285-2.5/AMS385-2.5
2k
1%
R
TC ADJ
500
Precision 1µA to 1mA Current Sources
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 (Ω) (Ω) 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 40.8 412 953Ω 12.17 11.17
S 6.4 63.4 150Ω 1.908 1.766
Typical supply current 50µA
AMS385-2.5
30V
R1
68k
2
-
LM312
3
+
I
*
-1.5V TO -27V
OUT
150pF
-30V
C1
R1
68k
2
-
7
6
4
R2
*I
=2.5V/R2
OUT
1.5V TO 27V
I
*
OUT
LM312
3
+
C1
150pF
7
6
4
R2
http://www.BDTIC.com/AMS
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics
16
12
8
4
0
OUTPUT VOLTAGE CHANGE (mV)
-4
0.1 1 10 100
0.01
REVERSE CURRENT (mA)
TA =125° C
TA =25° C
TA =-55° C
Reverse Characteristics Forward Characteristics
100
A)
µ
10
REVERSE CURRENT (
0.1
TA =125° C
1
TA =25° C
0
0.5
1.0 1.5
REVERSE VOLTAGE (V)
AMS285-2.5/AMS385-2.5
1.6
TA =-55° C
2.0
2.5
3.0
1.2
0.8
TA =25° C
0.4
FORWARD VOLTAGE (V)
TA =125° C
0
0.1 1 10 100
0.01
FORWARD CURRENT (mA)
TA =-55° C
Reverse Dynamic Impedance
1000
)
Ω
100
10
1
TA =25° C
DYNAMIC IMPEDANCE (
0.1
0.01
REVERSE CURRENT (mA)
Filtered Output Noise
120
IR= 100µA
100
V)
µ
80
60
AMS385-2.5
40
20
INTEGRATED NOISE (
0
100 1k 10k 100k
CUTOFF FREQUENCY (Hz)
TA =125° C
TA =-55° C
0.1 1 10 100
SINGLE POLE LOW PASS
100µA
OUTPUT
SHARP CUTOFF
FILTER
Temperature Drift
2.530
2.520
2.510
2.500
2.490
2.480
2.470
REFERENCE VOLTAGE (V)
2.460
2.450
Hz)
√
NOISE (nV/
1400
1200
1000
800
600
400
200
0
-35 -15
-55
Noise Voltage
10
5
TEMPERATURE (° C)
100 1k 10k 100k
FREQUENCY (Hz)
25 45
IR= 100µA
65 85 105
IR= 100µA
125
Reverse Dynamic Impedance
10k
TA =25° C
)
IR= 100µA
Ω
1k
100
10
1
DYNAMIC IMPEDANCE (
0.1
10
100
FREQUENCY (Hz)
Response Time
3.0
2.0
1.0
0
~
~
10
VOLTAGE SWING (V)
0
0
10k 100k
1k
OUTPUT
INPUT
100k
OUTPUT
INPUT
200 400 600
TIME (
µ
s)
1M
~
~
AMS285-2.5/AMS385-2.5
http://www.BDTIC.com/AMS
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD TO-92 PLASTIC PACKAGE (N)
0.060±0.005
(1.524±0.127)
DIA
0.180±0.005
(4.572±0.127)
0.180±0.005
(4.572±0.127)
0.90
(2.286)
NOM
0.060±0.010
(1.524±0.254)
0.140±0.010
(3.556±0.127)
10°
NOM
N (TO-92 ) AMS DRW# 042391
0.500
(12.70)
MIN
0.050±0.005
(1.270±0.127)
0.050
(1.270)
MAX
0.016±0.003
(0.406±0.076)
UNCONTROLLED
LEAD DIMENSIONS
5° NOM
0.015±0.002
(0.381±0.051)
8 LEAD SOIC PLASTIC PACKAGE (S)
0.189-0.197*
(4.801-5.004)
87 65
0.228-0.244
(5.791-6.197)
0.150-0.157**
(3.810-3.988)
12 34
0.053-0.069
(1.346-1.752)
0.014-0.019
(0.355-0.483)
*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
(0.101-0.254)
0.050
(1.270)
TYP
0.004-0.010
0.008-0.010
(0.203-0.254)
0.010-0.020
(0.254-0.508)
0.016-0.050
(0.406-1.270)
x 45°
0°-8° TYP
S (SO-8 ) AMS DRW# 042293
AMS285-2.5/AMS385-2.5
http://www.BDTIC.com/AMS
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
SOT-89 PLASTIC PACKAGE (L)
0.173-0.181
0.155-0.167
(3.94-4.25)
0.090-0.102
(2.29-2.60)
(4.40-4.60)
0.064-0.072
(1.62-1.83)
0.035-0.047
(0.89-1.20)
0.055-0.063
(1.40-1.60)
0.084-0.090
(2.13-2.29)
0.014-0.017
(0.35-0.44)
0.059
(1.50)
BSC
0.118
(3.00)
BSC
0.017-0.022
(0.44-0.56)
0.014-0.019
(0.36-0.48)
L (SOT-89 ) AMS DRW# 042392
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