Omega Products AD590L Installation Manual

AD590JFAD590JF AD590KF

User’s Guide

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AD590

Temperature Sensors

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.

w

2-Terminal IC

–

Temperature Transducer

FEATURES

Linear current output: 1 µA/K
Wide temperature range: −55°C to +150°C
Pr

obe-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

isolation from case

Sensor
Low cost

GENERAL DESCRIPTION

e AD590 is a 2-terminal integrated circuit temperature
tran

sducer that produces an output current proportional to

absolute temperature. For supply voltages between 4 V and

V, the device acts as a high impedance, constant current

30
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).

e

AD590 should be used in any temperature-sensing
application below 150°C in which conventional electrical
temperature sensors are currently employed. e 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.

AD590

PIN CONFIGURATIONS

NC

1

2

V+

TOP VIEW

(Not to Scale)

V–

3

4

420-3

3
500

+ –

Fi

gure 1. 2-Lead CQFP Figure 2. 8-Lead SOIC

+

gure 3. 3-Pin TO-52

Fi

5
2
0-

3
35

0

NC

NC = NO CONNECT

PRODUCT HIGHLIGHTS

1. e 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
ci

rcuits 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
AD

590 units are easily interchangeable.

NC

8

7

NC

NC

6

5

NC

100

­33500

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.
e

AD590 is available in chip form, making it suitable for
hybrid circuits and fast temperature measurements in
protected environments.

e AD590 is particularly useful in remote sensing applications.
e

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. e output characteristics also make the

easy to multiplex: the current can be switched by a

AD590

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). ese
features make the AD590 easy to apply as a remote sensor.

4. e high output impedance (>10 MΩ) provides excellent
rejection of supply voltage dri and ripple. For instance,

ging the power supply from 5 V to 10 V results in only

chan
a 1 µA maximum current change, or 1°C equivalent error.

5. e AD590 is electrically durable: it withstands a forward
voltage of up to 44 V and a reverse voltage of 20 V.
e

refore, supply irregularities or pin reversal does not

damage the device.

CMOS multiplexer, or the supply voltage can be switched by a
lo

gic gate output.

AD590

TABLE OF CONTENTS

Features.............................................................................................. 1

Ge

neral Description ......................................................................... 1

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

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

Configurations ...........................................................................1

Pin

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

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

Specifications..................................................................................... 3

AD590J

AD590L

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

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

Ge

Circuit Description....................................................................... 6

and AD590K Specifications ......................................... 3

and AD590M Specifications ....................................... 4

neral Description ......................................................................... 6

Error vs. Temperature: with Calibration Error Trimmed

Out...................................................................................................7

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

Nonlinearity...................................................................................7

Voltage and ermal Environment Effects ...............................8

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

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

Page 2 of 16

AD590

SPECIFICATIONS

AD590J AND AD590K SPECIFICATIONS

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

Table 1.

AD590J AD590K
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)

Without External Calibration Adjustment
With 25°C Calibration Error Set to Zero
Nonlinearity
For TO-52 and CQFP Packages
For 8-Lead SOIC Package
Repeatability

Long-Term Drift

2

3

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 10
Effective Shunt Capacitance 100 100 pF
Electrical Turn-On Time 20 20 µs
Reverse Bias Leakage Current (Reverse Voltage = 10 V)

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

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.

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

1

4

30

±5.0

±10
±3.0

±1.5
±1.5

4

30 V

±2.5

±5.5
±2.0

±0.8
±1.0

°C

°C
°C

°C

°C
±0.1 ±0.1 °C
±0.1 ±0.1 °C

pA/√Hz

10

10

4

10 10 pA

10

Ω

Page 3 of 16

AD590

K°C

AD590L AND AD590M SPECIFICATIONS

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

Table 2.

AD590L AD590M
Parameter Min Typ Max Min Typ Max Unit

POWER SUPPLY

Operating Voltage Range 4 30 4 30 V

OUTPUT

Nominal Current Output @ 25°C (298.2K) 298.2 298.2 µA
Nominal Temperature Coefficient 1 1 µA/K
Calibration Error @ 25°C ±1.0 ±0.5 °C
Absolute Error (Over Rated Performance Temperature Range) °C

Without External Calibration Adjustment ±3.0 ±1.7 °C
With ± 25°C Calibration Error Set to Zero ±1.6 ±1.0 °C
Nonlinearity ±0.4 ±0.3 °C
Repeatability
Long-Term Drift

2

3

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 10
Effective Shunt Capacitance 100 100 pF
Electrical Turn-On Time 20 20 µs
Reverse Bias Leakage Current (Reverse Voltage = 10 V)

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.

1

±0.1 ±0.1 °C
±0.1 ±0.1 °C

10

10

4

10 10 pA

10

Ω

+223°

°

°F

–50

°

–100° 0° +100° +200° +300°

Figure 4. Temperature Scale Conversion Equations

+273°0°+298°

+32° +70° +212°

5
9

9

°F = °C + 32)

5

+25°

(

(

+323°

+50°

32)

+373°

+100°

+ 273.15°C = °F – K = °C

+423°

+150°

2
0
0

­3
3
5
00

+ 459.7R = °F

Page 4 of 16