Low Cost, Precision IC a Temperature Transducer AD592 CONNECTION DIAGRAM FEATURES High Precalibrated Accuracy: 0.58C max +258C Excellent Linearity: 0.158C max (08C to +708C) Wide Operating Temperature Range: 258C to +1058C PIN 3 PIN 2 PIN 1 Single Supply Operation: +4 V to +30 V Excellent Repeatability and Stability () (NC) (+) High Level Output: 1 mA/K Two Terminal Monolithic IC: Temperature In/ PIN 2 CAN BE EITHER ATTACHED OR UNCONNECTED * Current Out BOTTOM VIEW Minimal Self-Heating Errors PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS The AD592 is a two terminal monolithic integrated circuit tem- 1. With a single supply (4 V to 30 V) the AD592 offers perature transducer that provides an output current propor- 0.5C temperature measurement accuracy. tional to absolute temperature. For a wide range of supply 2. A wide operating temperature range (25C to +105C) voltages the transducer acts as a high impedance temperature and highly linear output make the AD592 an ideal sub- dependent current source of 1 A/K. Improved design and laser stitute for older, more limited sensor technologies (i.e., wafer trimming of the ICs thin film resistors allows the AD592 thermistors, RTDs, diodes, thermocouples). to achieve absolute accuracy levels and nonlinearity errors previ- 3. The AD592 is electrically rugged supply irregularities ously unattainable at a comparable price. and variations or reverse voltages up to 20 V will not The AD592 can be employed in applications between 25C damage the device. and +105C where conventional temperature sensors (i.e., ther- 4. Because the AD592 is a temperature dependent current mistor, RTD, thermocouple, diode) are currently being used. source, it is immune to voltage noise pickup and IR The inherent low cost of a monolithic integrated circuit in a drops in the signal leads when used remotely. plastic package, combined with a low total parts count in any given application, make the AD592 the most cost effective tem- 5. The high output impedance of the AD592 provides perature transducer currently available. Expensive linearization greater than 0.5C/V rejection of supply voltage drift and circuitry, precision voltage references, bridge components, resis- ripple. tance measuring circuitry and cold junction compensation are 6. Laser wafer trimming and temperature testing insures not required with the AD592. that AD592 units are easily interchangeable. Typical application areas include: appliance temperature sens- 7. Initial system accuracy will not degrade significantly over ing, automotive temperature measurement and control, HVAC time. The AD592 has proven long term performance (heating/ventilating/air conditioning) system monitoring, indus- and repeatability advantages inherent in integrated cir- trial temperature control, thermocouple cold junction compen- cuit design and construction. sation, board-level electronics temperature diagnostics, temperature readout options in instrumentation, and tempera- ture correction circuitry for precision electronics. Particularly 378 useful in remote sensing applications, the AD592 is immune to voltage drops and voltage noise over long lines due to its high 343 impedance current output. AD592s can easily be multiplexed the signal current can be switched by a CMOS multiplexer or o 1A/ K the supply voltage can be enabled with a tri-state logic gate. The AD592 is available in three performance grades: the 273 AD592AN, AD592BN and AD592CN. All devices are pack- 248 aged in a plastic TO-92 case rated from 45C to +125C. Per- formance is specified from 25C to +105C. AD592 chips are 45 25 0 +70 +105 +125 also available, contact the factory for details. o TEMPERATURE C REV. B 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781/329-4700 Fax: 781/461-3113 I A OUTAD592SPECIFICATIONS (typical T = +258C, V = +5 V, unless otherwise noted) A S AD592AN AD592BN AD592CN Model Min Typ Max Min Typ Max Min Typ Max Units ACCURACY 1 Calibration Error +25C 1.5 2.5 0.7 1.0 0.3 0.5 C T = 0C to +70C A Error over Temperature 1.8 3.0 0.8 1.5 0.4 0.8 C 2 Nonlinearity 0.15 0.35 0.1 0.25 0.05 0.15 C T = 25C to +105C A 3 Error over Temperature 2.0 3.5 0.9 2.0 0.5 1.0 C 2 Nonlinearity 0.25 0.5 0.2 0.4 0.1 0.35 C OUTPUT CHARACTERISTICS Nominal Current Output +25C (298.2K) 298.2 298.2 298.2 A Temperature Coefficient 1 1 1 A/C 4 Repeatability 0.1 0.1 0.1 C 5 Long Term Stability 0.1 0.1 0.1 C/month ABSOLUTE MAXIMUM RATINGS Operating Temperature 25 +105 25 +105 25 +105 C 6 Package Temperature 45 +125 45 +125 45 +125 C Forward Voltage (+ to ) 44 44 44 V Reverse Voltage ( to +) 20 20 20 V Lead Temperature (Soldering 10 sec) 300 300 300 C POWER SUPPLY Operating Voltage Range 4 30 4 30 4 30 V Power Supply Rejection +4 V < V < +5 V 0.5 0.5 0.5 C/V S +5 V < V < +15 V 0.2 0.2 0.2 C/V S +15 V < V < +30 V 0.1 0.1 0.1 C/V S NOTES 1 An external calibration trim can be used to zero the error +25C. 2 Defined as the maximum deviation from a mathematically best fit line. 3 Parameter tested on all production units at +105C only. C grade at 25C also. 4 Maximum deviation between +25C readings after a temperature cycle between 45C and +125C. Errors of this type are noncumulative. 5 Operation +125C, error over time is noncumulative. 6 Although performance is not specified beyond the operating temperature range, temperature excursions within the package temperature range will not damage the device. Specifications subject to change without notice. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units. METALIZATION DIAGRAM TEMPERATURE SCALE CONVERSION EQUATIONS 66MILS V+ 42MILS V 5 K = C +273.15 8C = (8F 32) 9 9 8F = 8C +32 R = F +459.7 5 2 REV. B