Data Sheet
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
Available in 2-lead FLATPACK, 4-lead LFCSP, 3-pin TO-52,
8-lead SOIC, and die form
+
–
2-Terminal IC
Temperature Transducer
AD590
PIN CONFIGURATIONS
V+ 1
4 NC
AD590
TOP VIEW
(Not to Scale)
V– 2
PIN 5 (EXPOSED PAD)
3 NC
GENERAL DESCRIPTION
The AD590 is a 2-terminal integrated circuit temperature trans-
ducer 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).
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 measure-
ment, level detection of fluids and anemometry. The AD590 is
available in die 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.
Figure 1. 2-Lead
FLATPACK
–
00533-024
NOTES
1. NC = NO CONNECT. THE NC PIN IS NOT
BONDED TO THE DIE INTERNALLY.
2. TO ENSURE CORRECT OPERATION, THE
EXPOSED PAD (EP) SHOULD BE LEFT FLOATING.
Figure 2. 4-Lead LFCSP
NC
1
V+
2
+
00533-025
8
7
NC
NC
TOP VIEW
V–
3
(Not to Scale)
6
NC
00533-001
NC
4
5
NC
NC = NO CONNECT
Figure 3. 3-Pin TO-52
Figure 4. 8-Lead SOIC
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 lineari-
zation circuits are all unnecessary in applying the device.
State-of-the-art laser trimming at the wafer level in
conjunction with extensive final testing ensures that
AD590 units are easily interchangeable.
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.
The high output impedance (>10 MΩ) provides excellent
rejection of supply voltage drift. 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.
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.
2.
3.
4.
5.
Rev. G
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Trademarks and registered trademarks are the property of their respective owners.
00533-104
AD590
TABLE OF CONTENTS
Features .....................................................................................1
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
Product Description ..................................................................6
Data Sheet
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 .......................................................................... 8
Voltage and Thermal Environment Effects............................ 8
General Applications............................................................... 10
Outline Dimensions ................................................................ 13
Ordering Guide ................................................................... 15
REVISION HISTORY
1/13—Rev. F to Rev. G
Changes to Endnote 2, Table 1...................................................3
Changes to Ordering Guide .....................................................15
11/12—Rev. E to Rev. F
Added 4-Lead LFCSP_WD ......................................... Universal
Changes to Features Section, General Description Section, and
Product Highlights Section........................................................1
Added Figure 2; Renumbered Sequentially................................1
Added Note 2, Table 1; Renumbered Sequentially .....................3
Changes to (Unbolded) For 8-Lead SOIC Package, AD590J and
AD590K Parameter, Table 1.......................................................3
Changes to Note 1, Table 3.........................................................5
Changes to Product Description Section ...................................6
Change to Figure 6.....................................................................6
Changes to Explanation of Temperature Sensor Specifications
Section.......................................................................................7
Moved Nonlinearity Section......................................................8
Change to Figure 13...................................................................8
Changes to General Applications Section ................................10
Changes to Figure 17 and Figure 19.........................................10
Deleted Figure 22; Renumbered Sequentially.......................... 11
Changes to Figure 21 and Figure 22 ........................................ 11
Deleted Figure 24 .................................................................... 12
Changes to Figure 24............................................................... 12
Updated Outline Dimensions Section ..................................... 14
Changes to Ordering Guide..................................................... 14
9/09—Rev. D to Rev. E
Changes to Product Description Section................................... 6
Updated Outline Dimensions.................................................. 13
Changes to 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. G | Page 2 of 16
Data Sheet
SPECIFICATIONS
AD590J AND AD590K SPECIFICATIONS
25°C and V
S
= 5 V, unless otherwise noted.
1
Table 1.
Parameter
POWER SUPPLY
Operating Voltage Range
OUTPUT
Nominal Current Output @ 25°C (298.2 K)
Nominal Temperature Coefficient
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
For 4-Lead LFCSP Package
Repeatability
3
Long-Term Drift
4
Current Noise
Power Supply Rejection
4 V ≤ V
S
≤ 5 V
5 V ≤ V
S
≤ 15 V
15 V ≤ V
S
≤ 30 V
Case Isolation to Either Lead
Effective Shunt Capacitance
Electrical Turn-On Time
Reverse Bias Leakage Current (Reverse Voltage = 10 V)
5
1
AD590
Min
4
AD590J
2
Typ
Max
30
298.2
1
±5.0
±10
±3.0
±1.5
±1.5
±1.5
±0.1
±0.1
40
0.5
0.2
0.1
10
10
100
20
10
Min
4
AD590K
Typ
Max
30
298.2
1
±2.5
±5.5
±2.0
±0.8
±1.0
±0.1
±0.1
40
0.5
0.2
0.1
10
10
100
20
10
Unit
V
µA
µA/K
°C
°C
°C
°C
°C
°C
°C
°C
pA/√Hz
µA/V
µV/V
µA/V
Ω
pF
µs
pA
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
The LFCSP package has a reduced operating temperature range of −40°C to +125°C.
3
Maximum deviation between +25°C readings after temperature cycling between −55°C and +150°C; guaranteed, not tested.
4
Conditions: constant 5 V, constant 125°C; guaranteed, not tested.
5
Leakage current doubles every 10°C.
Rev. G | Page 3 of 16
AD590
AD590L AND AD590M SPECIFICATIONS
25°C and V
S
= 5 V, unless otherwise noted.
1
Table 2.
Parameter
POWER SUPPLY
Operating Voltage Range
OUTPUT
Nominal Current Output @ 25°C (298.2 K)
Nominal Temperature Coefficient
Calibration Error @ 25°C
Absolute Error (Over Rated Performance Temperature Range)
Without External Calibration Adjustment
With ± 25°C Calibration Error Set to Zero
Nonlinearity
Repeatability
2
Long-Term Drift
3
Current Noise
Power Supply Rejection
4 V ≤ V
S
≤ 5 V
5 V ≤ V
S
≤ 15 V
15 V ≤ V
S
≤ 30 V
Case Isolation to Either Lead
Effective Shunt Capacitance
Electrical Turn-On Time
Reverse Bias Leakage Current (Reverse Voltage = 10 V)
4
1
Data Sheet
Min
4
AD590L
Typ
Max
30
298.2
1
±1.0
±3.0
±1.6
±0.4
±0.1
±0.1
40
0.5
0.2
0.1
10
10
100
20
10
Min
4
AD590M
Typ
Max
30
298.2
1
±0.5
±1.7
±1.0
±0.3
±0.1
±0.1
40
0.5
0.2
0.1
10
10
100
20
10
Unit
V
μA
μA/K
°C
°C
°C
°C
°C
°C
°C
pA/√Hz
μA/V
μA/V
μA/V
Ω
pF
μs
pA
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.
°K
°C
+223°
–50°
+273° +298° +323°
0°
+25°
+50°
+373°
+100°
+423°
+150°
°F –100°
0°
+32°
+100°
+70°
+200°
+212°
+300°
C
½
5
F
32
K
½
C
273.15
9
9
F
½
C
32
R
½
F
459.7
5
Figure 5. Temperature Scale Conversion Equations
Rev. G | Page 4 of 16
00533-002
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Forward Voltage ( E+ or E−)
Reverse Voltage (E+ to E−)
Breakdown Voltage (Case E+ or E−)
Rated Performance Temperature Range
1
Storage Temperature Range
1
Lead Temperature (Soldering, 10 sec)
1
AD590
Rating
44 V
−20 V
±200 V
−55°C to +150°C
−65°C to +155°C
300°C
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.
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.
Applicable to 2-lead FLATPACK and 3-pin TO-52 packages only.
ESD CAUTION
Rev. G | Page 5 of 16
Embedded System
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