ROHS AMS285-1.2, AMS385-1.2 Technical data
http://www.BDTIC.com/AMS
Advanced AMS285-1.2/AMS385-1.2
Monolithic MICROPOWER VOLTAGE REFERENCE DIODE
Systems
RoHS compliant
FEATURES APPLICATIONS
• ±4 mV (±0.3%) max. initia
• Operating Current 10µA to 20mA • Instrumentation
• Low Voltage Reference 1.235 • A/D, D/A Converters
• Max. 0.6Ω Dynamic Impedance (A grade) • Temperature measurement
• Low Temperature Coefficient • Current sources
• 2.5V Devi
AMS285-2.5 and AMS285 series, respectively
AMS385-2.5 and AMS385 seri
GENERAL DESCRIPTION
The AMS285-1.2/AMS385-1.2 are two-terminal micropower band-gap voltage reference diodes. They feature a very low
dynamic impedance and good tem
used to provide tight voltage tolerance. Since the AMS285-1.2/AMS385-1.2 is a band-gap reference, uses only transistors and
resistors, low noise and good long-term stability result. Careful design of the AMS285-1.2/AMS385-1.2 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
AMS285-1.2/AMS385-1.2 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 AMS285-1.2 is operational in the full industrial temperature range of -40°C to
a 0°C to 70°C temperature range. The AMS285-1.2/AMS385-1.2 are available in TO-92, SO-8 and SOT-89 packages.
ORDERING INFORMATION:
TOL. PACKAGE TYPE OPERATING
±4mV AMS285-1.2AN AMS285-1.2AS AMS285-1.2AL
±12mV AMS285-1.2BN AMS285-1.2BS AMS285-1.2BL
±25mV AMS285-1.2CN AMS285-1.2CS AMS285-1.2CL
±4mV AMS385-1.2AN AMS385-1.2AS AMS385-1.2AL
±12mV AMS385-1.2BN AMS385-1.2BS AMS385-1.2BL
±25mV AMS385-1.2CN AMS385-1.2CS AMS385-1.2CL
ce and Adjustable Device also available • Notebook/Personal Computer
TO-92 8 LEAD SOIC SOT-89
l tolerance (A grade) • Battery Powered Systems
• Monitors/ VCR/ TV
es.
perature coefficient, operating over a 10µA to 20mA current range. On-chip trimming is
• Pagers
85°C while AMS385-1.2 i
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
s operating over
AMS285-1.2/AMS385-1.2
http://www.BDTIC.com/AMS
ABSOLUTE MAXIMUM RATINGS
Reverse Current 30mA Storage temperature
Forward Current 10mA Soldering information (25 sec)
Operating Temperature Range
AMS285-1.2
AMS385-1.2
-40°C to
0°C to
5°C
8
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-1.2
Min Typ Max
1.231 1.235 1.239 1.223 1.235
0.2 0.60 1 1
1.0
10
8 10
20
AMS285B-1.2
Min Typ Max
1.247 1.205 1.235 1.260
1.0
10
8 10
20
-55°C to +150°C
265°C
AMS285C-1.2
Min Typ Max
1.0
8 15
20
25
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
1.231 1.235 1.239 1.223 1.235 1.247 1.205 1.235 1.260
≤1mA
R
≤20mA
R
60 60 60
25
20 20 20 ppm
AMS385A-1.2
AMS385B-1.2
50
Min Typ Max
0.2 0.60 1 1
1.0
10
8 10
60 60 60
20
1.0
8 10
AMS385C-1.2
Min Typ Max
1.0
20
8 15
20
100 150
20
25
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
AMS285-1.2/AMS385-1.2
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, 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 Reference from
Range Reference from 9V Battery 1.5V Battery
= 2.3V TO 30V
V
IN
LM334
AMS385-1.2
4.3k
OUT
1.24V
9V
500k
1.2V
AMS385-1.2
1.5V
3k
1.2V
AMS385-1.2
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