2-Terminal IC
Temperature Transducer
Data Sheet
AD590
FEATURES PIN CONFIGURATIONS
Linear current output: 1 A/K
Wide temperature range: 55C to +150C V+ 1
4NC
AD590
Probe-compatible ceramic sensor package
TOP VIEW
2-terminal device: voltage in/current out
(Not to Scale)
Laser trimmed to 0.5C calibration accuracy (AD590M) PIN 5 (EXPOSED PAD)
V 2
3NC
Excellent linearity: 0.3C over full range (AD590M)
Wide power supply range: 4 V to 30 V
NOTES
Sensor isolation from case
1. NC = NO CONNECT. THE NC PIN IS NOT
BONDED TO THE DIE INTERNALLY.
Available in 2-lead FLATPACK, 4-lead LFCSP, 3-pin TO-52,
2. TO ENSURE CORRECT OPERATION, THE
EXPOSED PAD (EP) SHOULD BE LEFT FLOATING.
8-lead SOIC, and die form
+
Figure 1. 2-Lead Figure 2. 4-Lead LFCSP
GENERAL DESCRIPTION
FLATPACK
The AD590 is a 2-terminal integrated circuit temperature trans-
ducer that produces an output current proportional to absolute
NC 1 8 NC
temperature. For supply voltages between 4 V and 30 V, the device
V+ 2 7 NC
TOP VIEW
acts as a high impedance, constant current regulator passing
V 3 (Not to Scale) 6 NC
+
1 A/K. Laser trimming of the chips thin-film resistors is used
4 5
NC NC
to calibrate the device to 298.2 A output at 298.2 K (25C).
NC = NO CONNECT
The AD590 should be used in any temperature-sensing
application below 150C in which conventional electrical Figure 3. 3-Pin TO-52 Figure 4. 8-Lead SOIC
temperature sensors are currently employed. The inherent
low cost of a monolithic integrated circuit combined with the
PRODUCT HIGHLIGHTS
elimination of support circuitry makes the AD590 an attractive
1. The AD590 is a calibrated, 2-terminal temperature sensor
alternative for many temperature measurement situations.
requiring only a dc voltage supply (4 V to 30 V). Costly
Linearization circuitry, precision voltage amplifiers, resistance
transmitters, filters, lead wire compensation, and lineari-
measuring circuitry, and cold junction compensation are not
zation circuits are all unnecessary in applying the device.
needed in applying the AD590.
2. State-of-the-art laser trimming at the wafer level in
In addition to temperature measurement, applications include
conjunction with extensive final testing ensures that
temperature compensation or correction of discrete components,
AD590 units are easily interchangeable.
biasing proportional to absolute temperature, flow rate measure-
ment, level detection of fluids and anemometry. The AD590 is 3. Superior interface rejection occurs because the output is a
available in die form, making it suitable for hybrid circuits and current rather than a voltage. In addition, power
fast temperature measurements in protected environments. requirements are low (1.5 mW @ 5 V @ 25C). These
features make the AD590 easy to apply as a remote sensor.
The AD590 is particularly useful in remote sensing applications.
The device is insensitive to voltage drops over long lines due to
4. The high output impedance (>10 M) provides excellent
its high impedance current output. Any well-insulated twisted
rejection of supply voltage drift. For instance, changing the
pair is sufficient for operation at hundreds of feet from the
power supply from 5 V to 10 V results in only a 1 A
receiving circuitry. The output characteristics also make the maximum current change, or 1C equivalent error.
AD590 easy to multiplex: the current can be switched by a
5. The AD590 is electrically durable: it withstands a forward
CMOS multiplexer, or the supply voltage can be switched by a
voltage of up to 44 V and a reverse voltage of 20 V.
logic gate output.
Therefore, supply irregularities or pin reversal does not
damage the device.
Rev. G Document Feedback
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COMPARABLE PARTS DESIGN RESOURCES
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PCN-PDN Information
DOCUMENTATION
Quality And Reliability
Application Notes
Symbols and Footprints
AN-272: Accuracies of the AD590
DISCUSSIONS
AN-273: Use of the AD590 Temperature Transducer in a
Remote Sensing Application
View all AD590 EngineerZone Discussions.
AN-348: Avoiding Passive-Component Pitfalls
AN-892: Temperature Measurement Theory and Practical
SAMPLE AND BUY
Techniques
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Data Sheet
AD590: 2-Terminal IC Temperature Transducer Data Sheet
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