ROHS AMS285-2.5, AMS385-2.5 Technical data

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