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AD592BN Datasheet(PDF) 1 Page - Analog Devices

Part # AD592BN
Description  Low Cost, Precision IC Temperature Transducer
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD592BN Datasheet(HTML) 1 Page - Analog Devices

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CONNECTION DIAGRAM
PIN 3
PIN 2
PIN 1
(–)
(NC)
(+)
PIN 2 CAN BE EITHER ATTACHED OR UNCONNECTED
BOTTOM VIEW
*
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
AD592*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
Low Cost, Precision IC
Temperature Transducer
FEATURES
High Precalibrated Accuracy: 0.5 C max @ +25 C
Excellent Linearity: 0.15 C max (0 C to +70 C)
Wide Operating Temperature Range: –25 C to +105 C
Single Supply Operation: +4 V to +30 V
Excellent Repeatability and Stability
High Level Output: 1
A/K
Two Terminal Monolithic IC: Temperature In/
Current Out
Minimal Self-Heating Errors
PRODUCT DESCRIPTION
The AD592 is a two terminal monolithic integrated circuit tem-
perature transducer that provides an output current propor-
tional to absolute temperature. For a wide range of supply
voltages the transducer acts as a high impedance temperature
dependent current source of 1
µA/K. Improved design and laser
wafer trimming of the IC’s thin film resistors allows the AD592
to achieve absolute accuracy levels and nonlinearity errors previ-
ously unattainable at a comparable price.
The AD592 can be employed in applications between –25
°C
and +105
°C where conventional temperature sensors (i.e., ther-
mistor, RTD, thermocouple, diode) are currently being used.
The inherent low cost of a monolithic integrated circuit in a
plastic package, combined with a low total parts count in any
given application, make the AD592 the most cost effective tem-
perature transducer currently available. Expensive linearization
circuitry, precision voltage references, bridge components, resis-
tance measuring circuitry and cold junction compensation are
not required with the AD592.
Typical application areas include: appliance temperature sens-
ing, automotive temperature measurement and control, HVAC
(heating/ventilating/air conditioning) system monitoring, indus-
trial temperature control, thermocouple cold junction compen-
sation, board-level electronics temperature diagnostics,
temperature readout options in instrumentation, and tempera-
ture correction circuitry for precision electronics. Particularly
useful in remote sensing applications, the AD592 is immune to
voltage drops and voltage noise over long lines due to its high
impedance current output. AD592s can easily be multiplexed;
the signal current can be switched by a CMOS multiplexer or
the supply voltage can be enabled with a tri-state logic gate.
The AD592 is available in three performance grades: the
AD592AN, AD592BN and AD592CN. All devices are pack-
aged in a plastic TO-92 case rated from –45
°C to +125°C. Per-
formance is specified from –25
°C to +105°C. AD592 chips are
also available, contact the factory for details.
*Protected by Patent No. 4,123,698.
PRODUCT HIGHLIGHTS
1. With a single supply (4 V to 30 V) the AD592 offers
0.5
°C temperature measurement accuracy.
2. A wide operating temperature range (–25
°C to +105°C)
and highly linear output make the AD592 an ideal sub-
stitute for older, more limited sensor technologies (i.e.,
thermistors, RTDs, diodes, thermocouples).
3. The AD592 is electrically rugged; supply irregularities
and variations or reverse voltages up to 20 V will not
damage the device.
4. Because the AD592 is a temperature dependent current
source, it is immune to voltage noise pickup and IR
drops in the signal leads when used remotely.
5. The high output impedance of the AD592 provides
greater than 0.5
°C/V rejection of supply voltage drift and
ripple.
6. Laser wafer trimming and temperature testing insures
that AD592 units are easily interchangeable.
7. Initial system accuracy will not degrade significantly over
time. The AD592 has proven long term performance
and repeatability advantages inherent in integrated cir-
cuit design and construction.
378
343
273
248
1µA/oK
–45
–25
0
+70
+105 +125
TEMPERATURE – oC


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