Advanced Monolithic Systems AMS285 Service Manual
http://www.BDTIC.com/AMS
Advanced AMS285/AMS385
Monolithic ADJUSTABLE MICROPOWER VOLTAGE REFERENCE DIODE
Systems
RoHS compliant
FEATURES APPLICATIONS
• Adjustable from 1.24V to 5.30V • Battery Powered Systems
• Operating Current 10µA to 20mA • Instrumentation
• 1% and 2% Initial Tolerance • A/D, D/A Converters
• 1Ω Dynamic Impedance • Temperature measurement
• Low Temperature Coefficient • Current sources
• 1.2V Device and 2.5V Device also available • Notebook/Personal Computer
AMS285-1.2 and AMS285-2.5 series, respectively
AMS385-1.2 and AMS385-2.5 series.
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. PACKAGE TYPE OPERATING
TO-92 8 LEAD SOIC SOT-89
±12mV AMS285AN AMS285AS AMS285AL
±25mV AMS285BN AMS285BS AMS285BL
±25mV AMS285CN AMS285CS AMS285CL
±12mV AMS385AN AMS385AS AMS385AL
±25mV AMS385BN AMS385BS AMS385BL
±25mV AMS385CN AMS385CS AMS385CL
• Monitors/ VCR/ TV
• Pagers
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.
http://www.BDTIC.com/AMS
AMS285/AMS385
ABSOLUTE MAXIMUM RATINGS
Reverse Current 30mA Storage temperature
Forward Current 10mA Soldering information ( 25 Sec)
Operating Temperature Range
AMS285
AMS385
-40°C to 85°C
0°C to 70°C
-55°C to +150°C
265°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
Parameter
Reference Voltage
Dynamic Output
Impedance
Reference Voltage
Change with Current
Min. Operating
Current (Note 4)
Wide Band Noise
(Note 5)
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
Conditions
=100 µA
I
R
I
=0.1IR, f = 20Hz
AC
V
= V
REF
= 5.3V
≤1mA
R
≤20mA
R
= V
REF
= 5.3V
= V
REF
= 5.3V
OUT
V
OUT
10µA ≤I
1mA ≤I
V
OUT
V
OUT
10Hz ≤ f ≤ 10kHz
V
OUT
V
OUT
=25°C±.1°C
T
A
T = 1000 Hr
Min Typ Max
1.228 1.240 1.252 1.215 1.240 1.265 1.215 1.240 1.265 V
0.2
6
20 20 20 ppm
AMS285A
0.3
0.7
4
30
50
170
25
AMS285B
Min Typ Max
1.0
10
9
45
0.3
0.7
0.2
4
6
30
50
170
50
AMS285C
Min Typ Max
1.0
10
9
45
0.3
0.7
0.2 4 1.0
6
30
50
170
100 150
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
Parameter
Conditions
AMS285A
Min Typ Max
AMS285B
Min Typ Max
AMS285C
Min Typ Max
Units
10
9
45
Ω
mV
mV
µA
µA
µV
rms
µV
rms
ppm/°C
Units
Reference Voltage
Dynamic Output
Impedance
Reference Voltage
Change with
Current
Min. Operating
Current (Note 4)
Wide Band Noise
(Note 5)
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
=100 µA
I
R
=0.1IR, f = 20Hz
I
AC
V
= V
REF
= 5.3V
≤1mA
R
≤20mA
R
= V
REF
= 5.3V
= V
REF
= 5.3V
OUT
V
OUT
10µA ≤I
1mA ≤I
V
OUT
V
OUT
10Hz ≤ f ≤ 10kHz
V
OUT
V
OUT
=25°C±.1°C
T
A
T = 1000 Hr
Advanced Monolithic Systems, Inc.
1.228 1.240 1.252 1.215 1.240 1.265 1.215 1.240 1.265 V
0.2
6
20 20 20 ppm
0.3
0.7
4
30
50
170
25
1.0
10
9
45
0.3
0.7
0.2
4
6
30
50
170
50
1.0
10
9
45
0.3
0.7
0.2 4 1.0
6
30
50
170
100 150
10
9
45
Ω
mV
mV
µA
µA
µV
rms
µV
rms
ppm/°C
http://www.BDTIC.com/AMS
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
Note 2: For elevated temperature operation, T
AMS285 +125°C
AMS385 +100°C
. The guaranteed specifications apply only for the test conditions listed.
max is:
j
Thermal Resistance TO-92 SO-8 SOT-89
ϕ
(junction to ambient)
JA
170°C/W (0.125” leads) 165°C/W 160°C/W
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
and T
T
MAX
, divided by T
MIN
MAX
- T
. The measured temperatures are 0°C, 25°C, 70°C and 85°C.
MIN
= TJ = 25°C.
A
PIN CONNECTIONS
TO-92 8L SOIC SOT-89
Plastic Package (N) SO Package (S) (L)
N/C ADJN/C
FB -+
123
+
756
123
12843
N/C N/C N/C
-
FB
-+
Bottom View Top View Top View
TYPICAL APPLICATIONS
1.2V Reference 5.0V Reference Precision 10V Reference
9V
+
AMS385
-
R1
500k
9V
1.2V
FB
AMS385
OUT
R1
50k
+
FB
-
R2
120k
R3
364k
⎟
⎜
R2
⎠
⎝
5V
⎞
⎛
R3
⎟
⎜
+= 1
1.24 V
15V
+
AMS385
-
R1
5k
R2
301k
1%
FB
R3
68.1k
1%
V
10V
OUT
Advanced Monolithic Systems, Inc.
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