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
TO-92
AMS285AN
AMS285BN
AMS285CN
AMS385AN
AMS385BN
AMS385CN
PACKAGE TYPE
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.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS285/AMS385
ABSOLUTE MAXIMUM RATINGS
Reverse Current
Forward Current
Operating Temperature Range
AMS285
AMS385
30mA
10mA
-40°C to 85°C
0°C to 70°C
Storage temperature
Soldering information ( 25 Sec)
-55°C to +150°C
265°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
R
= 100
µA,
and T
A
= +25°C unless otherwise specified.
Parameter
Reference Voltage
Dynamic Output
Impedance
Conditions
I
R
=100
µA
I
AC
=0.1I
R
, f = 20Hz
V
OUT
= V
REF
V
OUT
= 5.3V
10µA
≤I
R
≤1mA
1mA
≤I
R
≤20mA
V
OUT
= V
REF
V
OUT
= 5.3V
10Hz
≤
f
≤
10kHz
V
OUT
= V
REF
V
OUT
= 5.3V
Min
1.228
AMS285A
Typ
Max
1.240
0.3
0.7
0.2
4
6
30
1.0
10
9
45
1.252
Min
1.215
AMS285B
Typ
Max
1.240
0.3
0.7
0.2
4
6
30
1.0
10
9
45
1.265
AMS285C
Min
Typ
Max
1.215
1.240
0.3
0.7
0.2
4
6
30
1.0
10
9
45
1.265
Units
V
Ω
Reference Voltage
Change with Current
Min. Operating
Current (Note 4)
Wide Band Noise
(Note 5)
mV
mV
µA
µA
50
170
25
50
170
50
50
170
100
150
µV
rms
µV
rms
ppm/°C
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
T
A
=25°C±.1°C
T = 1000 Hr
20
20
20
ppm
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
R
= 100
µA,
and T
A
= +25°C unless otherwise specified.
Parameter
Reference Voltage
Dynamic Output
Impedance
Conditions
I
R
=100
µA
I
AC
=0.1I
R
, f = 20Hz
V
OUT
= V
REF
V
OUT
= 5.3V
10µA
≤I
R
≤1mA
1mA
≤I
R
≤20mA
V
OUT
= V
REF
V
OUT
= 5.3V
10Hz
≤
f
≤
10kHz
V
OUT
= V
REF
V
OUT
= 5.3V
Min
1.228
AMS285A
Typ
Max
1.240
0.3
0.7
0.2
4
6
30
1.0
10
9
45
1.252
Min
1.215
AMS285B
Typ
Max
1.240
0.3
0.7
0.2
4
6
30
1.0
10
9
45
1.265
AMS285C
Min
Typ
Max
1.215
1.240
0.3
0.7
0.2
4
6
30
1.0
10
9
45
1.265
Units
V
Ω
Reference Voltage
Change with
Current
Min. Operating
Current (Note 4)
Wide Band Noise
(Note 5)
mV
mV
µA
µA
50
170
25
50
170
50
50
170
100
150
µV
rms
µV
rms
ppm/°C
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
T
A
=25°C±.1°C
T = 1000 Hr
20
20
20
ppm
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
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, T
j
max is:
AMS285
AMS385
+125°C
+100°C
Thermal Resistance
ϕ
JA
(junction to ambient)
TO-92
170°C/W (0.125” leads)
SO-8
165°C/W
SOT-89
160°C/W
Note 3:
Parameters identified with
boldface type
apply at temperature extremes. All other numbers apply at T
A
= T
J
= 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
T
MAX
and T
MIN
, divided by T
MAX
- T
MIN
. The measured temperatures are 0°C, 25°C, 70°C and 85°C.
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