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a 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

Low Cost, Precision IC Temperature Transducer AD592* CONNECTION DIAGRAM

PIN 3

PIN 2

PIN 1

(–)

(NC)

(+)

  • PIN 2 CAN BE EITHER ATTACHED OR UNCONNECTED BOTTOM VIEW

PRODUCT DESCRIPTION

PRODUCT HIGHLIGHTS

The AD592 is a two terminal monolithic integrated circuit temperature transducer that provides an output current proportional 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 previously unattainable at a comparable price.

1. With a single supply (4 V to 30 V) the AD592 offers 0.5°C temperature measurement accuracy.

Typical application areas include: appliance temperature sensing, automotive temperature measurement and control, HVAC (heating/ventilating/air conditioning) system monitoring, industrial temperature control, thermocouple cold junction compensation, board-level electronics temperature diagnostics, temperature readout options in instrumentation, and temperature 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 packaged in a plastic TO-92 case rated from –45°C to +125°C. Performance is specified from –25°C to +105°C. AD592 chips are also available, contact the factory for details.

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 circuit design and construction. 378

343 IOUT – µA

The AD592 can be employed in applications between –25°C and +105°C where conventional temperature sensors (i.e., thermistor, 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 temperature transducer currently available. Expensive linearization circuitry, precision voltage references, bridge components, resistance measuring circuitry and cold junction compensation are not required with the AD592.

2. A wide operating temperature range (–25°C to +105°C) and highly linear output make the AD592 an ideal substitute for older, more limited sensor technologies (i.e., thermistors, RTDs, diodes, thermocouples).

1µA/oK

273 248 –45

–25

0

+70

+105 +125

TEMPERATURE – oC

  • 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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