ADMOS AMS1004-2.5BN, AMS1004-2.5BL, AMS1004-2.5AS, AMS1004-2.5AN, AMS1004-2.5AL Datasheet

Advanced AMS1004-2.5
Monolithic MICROPOWER VOLTAGE REFERENCE
Systems

FEATURES APPLICATIONS

•• ±20 mV (±0.3%) max. initial tolerance (A grade) •• Battery Powered Systems

•• Operating Current 20µµA to 20mA •• Instrumentation

•• Low Voltage Reference 2.5V •• A/D, D/A Converters

•• Max. 0.6ΩΩ Dynamic Impedance (A grade) •• Temperature measurement

•• Low Temperature Coefficient •• Current sources

•• 1.2V Device also available, AMS1004-1.2 •• Notebook/Personal Computer

•• Monitors/ VCR/ TV

•• Pagers

GENERAL DESCRIPTION

The AMS1004-2.5 is a two-terminal micropower band-gap voltage reference diode. It features a very low dynamic impedance
and good temperature coefficient, operating over a 20µA to 20mA current range. On-chip trimming is used to provide tight
voltage tolerance. Since the AMS1004-2.5 is a band-gap reference, uses only transistors and resistors, low noise and good
long term stability result. Careful design of the AMS1004-2.5 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 AMS1004-2.5 makes these reference
diodes useful for micropower circuitry. This voltage reference 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, making it attractive
for use in systems where accuracy was previously obtained at the expense of power consumption and trimming.

The AMS1004-2.5 is operational over a temperature range of 0°C to 70°C and is available in TO-92, SO-8 and SOT-89
packages. For extended temperature range contact factory.

ORDERING INFORMATION:

TOL. PACKAGE TYPE OPERATING

TO-92 8 LEAD SOIC SOT-89

±20mV AMS1004-2.5AN AMS1004-2.5AS AMS1004-2.5AL
±40mV AMS1004-2.5BN AMS1004-2.5BS AMS1004-2.5BL

TEMPERATURE RANGE

0 to 70° C
0 to 70° C

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

ABSOLUTE MAXIMUM RATINGS

Reverse Current 30mA Storage temperature
Forward Current 10mA Soldering information
Operating Temperature Range

0°C to 70°C

TO-92 package: 10 sec.
SOIC package: Vapor phase (60 sec)
Infrared (15 sec.)
SOT-89 package: 10 sec.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.

AMS1004-2.5

-55°C to +150°C
260°C

215°C
220°C
265°C

Parameter Conditions

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)

Temperature Coeff.
(Note 6)

Long Term Stability
(Note 5)

IR - 100 µA

IR - 100 µA, f = 20Hz
10µA ≤IR ≤1mA

1mA ≤IR ≤20mA

IR - 100 µA,
10Hz ≤ f ≤ 10kHz

TA=25°C±.1°C
T = 1000 Hr

AMS1004A-2.5

Min Typ Max

2.480 2.500 2.520 2.460 2.500 2.540 V

0.2 0.60 0.2 0.60

1.0
10

12 10

20

120 120

25 50

20 20 ppm

AMS1004B-2.5

Min Typ Max

12 10

1.0
10

20

Units

Ω

mV

µA
µA

µV

ppm/°C

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

max is +100°C

j

Thermal Resistance TO-92 SO-8 SOT-89

ϕ

(junction to ambient)

JA

Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T

170°C/W (0.125” leads) 165°C/W 160°C/W

= TJ = 25°C.

A

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

T

, divided by T

MIN

MAX

- T

. The measured temperatures are 0°C, 25°C, 70°C.

MIN

MAX and

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

PIN CONNECTIONS

TO-92 SO-8 SOT-89

Plastic Package (N) SO Package (S) (L)

123

Bottom View Top View Top View

TYPICAL APPLICATIONS

Wide Input Micropower Reference

Range Reference from 9V Battery

N/C N/CN/C

+
8437 56

1 2

N/C N/C N/C

AMS1004-2.5

123

-

N/C

-+

VIN = 3.7V TO 30V

LM334

3.3k

OUT

2.5V

AMS1004-2.5

Micropower Thermocouple Cold Junction Compensator

+

LM334

V

18k

1M
1%

-

V

+

3V

LITHIUM

THERMOCOUPLE

AMS1004-2.5

+

-

COLD JUNCTION

ZERO ADJ
100k

R2

ISO THERMAL

WITH LM334

R1

+

METER

-

9V

200k

2.5V

AMS1004-2.5

2k
1%

R

Adjustment Procedure

TC ADJ
500

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 (ΩΩ) (ΩΩ) 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

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]