ANALOG DEVICES AD 590 KF Datasheet

2-Terminal IC

–

FEATURES

Linear current output: 1 μA/K
Wide temperature range: −55°C to +150°C
Probe-compatible ceramic sensor package
2-terminal device: voltage in/current out
Laser trimmed to ±0.5°C calibration accuracy (AD590M)
Excellent linearity: ±0.3°C over full range (AD590M)
Wide power supply range: 4 V to 30 V
Sensor isolation from case
Low cost

GENERAL DESCRIPTION

The AD590 is a 2-terminal integrated circuit temperature trans­ducer that produces an output current proportional to absolute
temperature. For supply voltages between 4 V and 30 V, the device
acts as a high impedance, constant current regulator passing
1 μA/K. Laser trimming of the chip’s thin-film resistors is used
to calibrate the device to 298.2 μA output at 298.2 K (25°C).

Temperature Transducer

PIN CONFIGURATIONS

1

NC

V+

2

TOP VIEW

(Not to Scale)

V–

3

NC

4

00533-024

+–

Figure 1. 2-Lead FLATPACK Figure 2. 8-Lead SOIC

+

0533-025

Figure 3. 3-Pin TO-52

NC = NO CONNECT

AD590

8

NC

7

NC

6

NC

5

NC

00533-001

The AD590 should be used in any temperature-sensing
application below 150°C in which conventional electrical
temperature sensors are currently employed. The inherent
low cost of a monolithic integrated circuit combined with the
elimination of support circuitry makes the AD590 an attractive
alternative for many temperature measurement situations.
Linearization circuitry, precision voltage amplifiers, resistance
measuring circuitry, and cold junction compensation are not
needed in applying the AD590.

In addition to temperature measurement, applications include
temperature compensation or correction of discrete components,
biasing proportional to absolute temperature, flow rate measure­ment, level detection of fluids and anemometry. The AD590 is
available in chip form, making it suitable for hybrid circuits and
fast temperature measurements in protected environments.

The AD590 is particularly useful in remote sensing applications.
The device is insensitive to voltage drops over long lines due to
its high impedance current output. Any well-insulated twisted
pair is sufficient for operation at hundreds of feet from the
receiving circuitry. The output characteristics also make the
AD590 easy to multiplex: the current can be switched by a
CMOS multiplexer, or the supply voltage can be switched by a
logic gate output.

PRODUCT HIGHLIGHTS

1. The AD590 is a calibrated, 2-terminal temperature sensor

requiring only a dc voltage supply (4 V to 30 V). Costly
transmitters, filters, lead wire compensation, and lineari­zation circuits are all unnecessary in applying the device.

2. State-of-the-art laser trimming at the wafer level in

conjunction with extensive final testing ensures that
AD590 units are easily interchangeable.

3. Superior interface rejection occurs because the output is a

current rather than a voltage. In addition, power
requirements are low (1.5 mW @ 5 V @ 25°C). These
features make the AD590 easy to apply as a remote sensor.

4. The high output impedance (>10 MΩ) provides excellent

rejection of supply voltage drift and ripple. For instance,
changing the power supply from 5 V to 10 V results in only
a 1 μA maximum current change, or 1°C equivalent error.

5. The AD590 is electrically durable: it withstands a forward

voltage of up to 44 V and a reverse voltage of 20 V.
Therefore, supply irregularities or pin reversal does not
damage the device.

Rev. E

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2006–2009 Analog Devices, Inc. All rights reserved.

AD590

TABLE OF CONTENTS

Features .............................................................................................. 1

Product Description ..........................................................................6

General Description ......................................................................... 1

Pin Configurations ........................................................................... 1

Product Highlights ........................................................................... 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

AD590J and AD590K Specifications ......................................... 3

AD590L and AD590M Specifications ....................................... 4

Absolute Maximum Ratings ............................................................ 5

ESD Caution .................................................................................. 5

REVISION HISTORY

9/09—Rev. D to Rev. E

Changes to Product Description Section ...................................... 6

Updated Outline Dimensions ....................................................... 13

Changes to Ordering Guide .......................................................... 14

Explanation of Temperature Sensor Specifications ..................7

Calibration Error ...........................................................................7

Error vs. Temperature: Calibration Error Trimmed Out .........7

Error vs. Temperature: No User Trims .......................................7

Nonlinearity ...................................................................................7

Voltage and Thermal Environment Effects ...............................8

General Applications ...................................................................... 10

Outline Dimensions ....................................................................... 13

Ordering Guide .......................................................................... 14

1/06—Rev. C to Rev. D

Updated Format .................................................................. Universal

Changes to Figure 4 Equation ......................................................... 4

9/03—Rev. B to Rev. C

Added SOIC-8 Package ...................................................... Universal

Change to Figure 1 ........................................................................... 1

Updated Outline Dimensions ....................................................... 13

Added Ordering Guide .................................................................. 14

Rev. E | Page 2 of 16

AD590

SPECIFICATIONS

AD590J AND AD590K SPECIFICATIONS

25°C and VS = 5 V, unless otherwise noted.1

Table 1.

AD590J AD590K
Parameter Min Typ Max Min Typ Max Unit

POWER SUPPLY

Operating Voltage Range

4

OUTPUT

Nominal Current Output @ 25°C (298.2K) 298.2 298.2 μA
Nominal Temperature Coefficient 1 1 μA/K
Calibration Error @ 25°C
Absolute Error (Over Rated Performance Temperature Range)

Without External Calibration Adjustment
With 25°C Calibration Error Set to Zero
Nonlinearity

For TO-52 and FLATPACK Packages

For 8-Lead SOIC Package
Repeatability2 ±0.1 ±0.1 °C
Long-Term Drift3 ±0.1 ±0.1 °C

Current Noise 40 40
Power Supply Rejection

4 V ≤ VS ≤ 5 V 0.5 0.5 μA/V
5 V ≤ VS ≤ 15 V 0.2 0.2 μV/V
15 V ≤ VS ≤ 30 V 0.1 0.1 μA/V

Case Isolation to Either Lead 1010 1010 Ω
Effective Shunt Capacitance 100 100 pF
Electrical Turn-On Time 20 20 μs
Reverse Bias Leakage Current (Reverse Voltage = 10 V)4 10 10 pA

1

Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All

minimum and maximum specifications are guaranteed, although only those shown in boldface are tested on all production units.

2

Maximum deviation between +25°C readings after temperature cycling between −55°C and +150°C; guaranteed, not tested.

3

Conditions: constant 5 V, constant 125°C; guaranteed, not tested.

4

Leakage current doubles every 10°C.

30 4 30 V

±5.0

±10
±3.0

±1.5
±1.5

±2.5

±5.5
±2.0

±0.8
±1.0

°C

°C
°C

°C
°C

pA/√Hz

Rev. E | Page 3 of 16

AD590

K°C

(

AD590L AND AD590M SPECIFICATIONS

25°C and VS = 5 V, unless otherwise noted.1

Table 2.

AD590L AD590M
Parameter Min Typ Max Min Typ Max Unit

POWER SUPPLY

Operating Voltage Range

OUTPUT

Nominal Current Output @ 25°C (298.2K) 298.2 298.2 μA
Nominal Temperature Coefficient 1 1 μA/K
Calibration Error @ 25°C
Absolute Error (Over Rated Performance Temperature Range) °C

Without External Calibration Adjustment
With ± 25°C Calibration Error Set to Zero
Nonlinearity
Repeatability2 ±0.1 ±0.1 °C

Long-Term Drift3 ±0.1 ±0.1 °C
Current Noise 40 40 pA/√Hz
Power Supply Rejection

4 V ≤ VS ≤ 5 V 0.5 0.5 μA/V

5 V ≤ VS ≤ 15 V 0.2 0.2 μA/V

15 V ≤ VS ≤ 30 V 0.1 0.1 μA/V
Case Isolation to Either Lead 1010 1010 Ω
Effective Shunt Capacitance 100 100 pF
Electrical Turn-On Time 20 20 μs
Reverse Bias Leakage Current (Reverse Voltage = 10 V)4 10 10 pA

1

Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All

minimum and maximum specifications are guaranteed, although only those shown in boldface are tested on all production units.

2

Maximum deviation between +25°C readings after temperature cycling between −55°C and +150°C; guaranteed, not tested.

3

Conditions: constant 5 V, constant 125°C; guaranteed, not tested.

4

Leakage current doubles every 10°C.

30 4 30 V

4

±1.0

±3.0
±1.6
±0.4

±0.5

±1.7
±1.0
±0.3

°C

°C
°C
°C

+223°

°

°F

–50°

–100° 0° +100° +200° +300°

Figure 4. Temperature Scale Conversion Equations

+273°0°+298°

+32° +70° +212°

5
9

⎛
⎜
⎝

+323°

+25°

+50°

)

9
5

⎞

+= FRCF

⎟
⎠

+373°
+100°

ooo

+=−= CKFC

oooo

+423°
+150°

00533-002

15.27332

7.45932

+=

Rev. E | Page 4 of 16

AD590

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Forward Voltage ( E+ or E−) 44 V
Reverse Voltage (E+ to E−) −20 V
Breakdown Voltage (Case E+ or E−) ±200 V
Rated Performance Temperature Range
Storage Temperature Range

1

−65°C to +155°C

1

−55°C to +150°C

Lead Temperature (Soldering, 10 sec) 300°C

1

The AD590 was used at −100°C and +200°C for short periods of

measurement with no physical damage to the device. However, the absolute
errors specified apply to only the rated performance temperature range.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

Rev. E | Page 5 of 16