2-Terminal IC
Temperature Transducer
AD590
FEATURES
PIN CONFIGURATIONS
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
NC
V+
V–
NC
1
2
3
4
8
7
6
5
NC
NC
NC
NC
TOP VIEW
(Not to Scale)
NC = NO CONNECT
+
–
Low cost
Figure 1. 2-Lead CQFP
Figure 2. 8-Lead SOIC
–
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).
+
Figure 3. 3-Pin TO-52
PRODUCT HIGHLIGHTS
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.
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.
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.
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.
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.
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. D
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
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