AD592 Analog Devices, AD592 Datasheet

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AD592

Manufacturer Part Number
AD592
Description
Manufacturer
Analog Devices
Datasheet

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a
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 A/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.
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.
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/
Minimal Self-Heating Errors
Current Out
PRODUCT HIGHLIGHTS
1. With a single supply (4 V to 30 V) the AD592 offers
2. A wide operating temperature range (–25 C to +105 C)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
3. The AD592 is electrically rugged; supply irregularities
4. Because the AD592 is a temperature dependent current
5. The high output impedance of the AD592 provides
6. Laser wafer trimming and temperature testing insures
7. Initial system accuracy will not degrade significantly over
0.5 C temperature measurement accuracy.
and highly linear output make the AD592 an ideal sub-
stitute for older, more limited sensor technologies (i.e.,
thermistors, RTDs, diodes, thermocouples).
and variations or reverse voltages up to 20 V will not
damage the device.
source, it is immune to voltage noise pickup and IR
drops in the signal leads when used remotely.
greater than 0.5 C/V rejection of supply voltage drift and
ripple.
that AD592 units are easily interchangeable.
time. The AD592 has proven long term performance
and repeatability advantages inherent in integrated cir-
cuit design and construction.
*
PIN 2 CAN BE EITHER ATTACHED OR UNCONNECTED
378
343
248
273
Temperature Transducer
–45
CONNECTION DIAGRAM
Low Cost, Precision IC
–25
PIN 3
(–)
TEMPERATURE –
0
BOTTOM VIEW
PIN 2
(NC)
1µA/
+70
o
PIN 1
K
o
(+)
C
+105 +125
AD592*
Fax: 617/326-8703

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AD592 Summary of contents

Page 1

... PIN 2 CAN BE EITHER ATTACHED OR UNCONNECTED * BOTTOM VIEW PRODUCT HIGHLIGHTS 1. With a single supply ( the AD592 offers 0.5 C temperature measurement accuracy wide operating temperature range (– +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 ...

Page 2

... METALIZATION DIAGRAM 66MILS V+ V– Max Cal Model Error @ +25 C AD592CN 0.5 C AD592BN 1.0 C AD592AN 2.5 C (typical @ unless otherwise noted AD592AN AD592BN Min Typ Max Min Typ 1.5 2.5 0.7 1.8 3.0 0.8 0.15 0.35 0.1 2.0 3.5 0.9 0.25 0.5 ...

Page 3

... C Long-Term Stability @ +85 C and 85% Relative Humidity 0.75 0.50 0.25 0 –0.25 –0.50 –0.75 0 500 1000 TIME – Hours Long-Term Stability @ +125 C –3– 0 –25 0 +25 +70 o TEMPERATURE – C AD592BN Accuracy Over Temperature 0 0 500 1000 1500 TIME – Hours 1500 2000 +105 2000 ...

Page 4

... C to +70 C and – +105 C. These specifications cor- respond to the actual error the user would see if the current out- put of an AD592 were converted to a voltage with a precision resistor. Note that the maximum error at room temperature, over the commercial IC temperature range extended range including the boiling point of water, can be directly read from the specifications table ...

Page 5

... AFTER SINGLE TEMPERATURE CALIBRATION –0.5 –1.0 –25 +25 TEMPERATURE – Figure 5. Effect of Scale Factor Trim on Accuracy If greater accuracy is desired, initial calibration and scale factor errors can be removed by using the AD592 in the circuit of Figure 6. 97.6k + 8.66k AD1403 7.87k AD592 V– Figure 6. Two Temperature Trim Circuit ...

Page 6

... In free air applications a clip-on heat sink will decrease output stabilization time by 10-20%. MOUNTING CONSIDERATIONS If the AD592 is thermally attached and properly protected, it can be used in any temperature measuring situation where the maximum range of temperatures encountered is between –25 C and +105 C. Because plastic IC packaging technology is em- ployed, excessive mechanical stress must be safeguarded against when fastening the device with a clamp or screw-on heat tab ...

Page 7

... Figure example of a temperature to 4–20 mA transmitter for use with systems. In this circuit the 1 A/K output of the AD592 is amplified to 1 mA/ C and offset so that equivalent and equivalent trimmed for proper reading at an intermediate reference temperature ...

Page 8

... That is, a decoder can be used to switch the supply volt- age to a column of AD592s while a MUX is used to control which row of sensors are being measured. The maximum num- ber of AD592s which can be used is the product of the number of channels of the decoder and MUX. An example circuit controlling 80 AD592s is shown in Figure 16 ...

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