2-Terminal IC Temperature Transducer AD590 Data Sheet FEATURES PIN CONFIGURATIONS Linear current output: 1 A/K Wide temperature range: -55C to +150C Probe-compatible ceramic sensor package 2-terminal device: voltage in/current out Laser trimmed to 0.5C calibration accuracy (AD590M) Excellent linearity: 0.3C over full range (AD590M) Wide power supply range: 4 V to 30 V Sensor isolation from case Available in 2-lead FLATPACK, 4-lead LFCSP, 3-pin TO-52, 8-lead SOIC, and die form V+ 1 TOP VIEW (Not to Scale) GENERAL DESCRIPTION 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 die form, making it suitable for hybrid circuits and fast temperature measurements in protected environments. 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. Rev. F 3 NC 00533-024 NOTES 1. NC = NO CONNECT. THE NC PIN IS NOT BONDED TO THE DIE INTERNALLY. 2. TO ENSURE CORRECT OPERATION, THE EXPOSED PAD (EP) SHOULD BE LEFT FLOATING. Figure 1. 2-Lead FLATPACK Figure 2. 4-Lead LFCSP - NC 1 8 NC NC TOP VIEW V- 3 (Not to Scale) 6 NC 00533-025 + Figure 3. 3-Pin TO-52 V+ 2 7 NC 4 5 NC NC = NO CONNECT 00533-001 The AD590 should be used in any temperature-sensing application below 150C 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. - PIN 5 (EXPOSED PAD) 00533-104 V- 2 + 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 A/K. Laser trimming of the chip's thin-film resistors is used to calibrate the device to 298.2 A output at 298.2 K (25C). 4 NC AD590 Figure 4. 8-Lead SOIC PRODUCT HIGHLIGHTS 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. 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 @ 25C). These features make the AD590 easy to apply as a remote sensor. 4. The high output impedance (>10 M) provides excellent rejection of supply voltage drift. For instance, changing the power supply from 5 V to 10 V results in only a 1 A maximum current change, or 1C equivalent error. 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. Document Feedback 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 registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 (c)2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD590 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Explanation of Temperature Sensor Specifications ..................7 General Description ......................................................................... 1 Calibration Error ...........................................................................7 Pin Configurations ........................................................................... 1 Error vs. Temperature: Calibration Error Trimmed Out .........7 Product Highlights ........................................................................... 1 Error vs. Temperature: No User Trims .......................................7 Revision History ............................................................................... 2 Nonlinearity ...................................................................................8 Specifications..................................................................................... 3 Voltage and Thermal Environment Effects ...............................8 AD590J and AD590K Specifications ......................................... 3 General Applications...................................................................... 10 AD590L and AD590M Specifications ....................................... 4 Outline Dimensions ....................................................................... 13 Absolute Maximum Ratings............................................................ 5 Ordering Guide .......................................................................... 15 ESD Caution .................................................................................. 5 Product Description ......................................................................... 6 REVISION HISTORY 11/12--Rev. E to Rev. F Added 4-Lead LFCSP_WD .............................................. Universal Changes to Features Section, General Description Section, and Product Highlights Section ............................................................. 1 Added Figure 2; Renumbered Sequentially .................................. 1 Added Note 2, Table 1; Renumbered Sequentially ....................... 3 Changes to (Unbolded) For 8-Lead SOIC Package, AD590J and AD590K Parameter, Table 1 ............................................................ 3 Changes to Note 1, Table 3 .............................................................. 5 Changes to Product Description Section ...................................... 6 Change to Figure 6 ........................................................................... 6 Changes to Explanation of Temperature Sensor Specifications Section ................................................................................................ 7 Moved Nonlinearity Section ........................................................... 8 Change to Figure 13 ......................................................................... 8 Changes to General Applications Section ................................... 10 Changes to Figure 17 and Figure 19............................................. 10 Deleted Figure 22; Renumbered Sequentially ............................ 11 Changes to Figure 21 and Figure 22 ............................................ 11 Deleted Figure 24............................................................................ 12 Changes to Figure 24...................................................................... 12 Updated Outline Dimensions Section ......................................... 14 Changes to Ordering Guide .......................................................... 14 9/09--Rev. D to Rev. E Changes to Product Description Section .......................................6 Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 14 1/06--Rev. C to Rev. D Updated Format .................................................................. Universal Changes to Figure 4 Equation..........................................................4 9/03--Rev. B to Rev. C Added SOIC-8 Package ..................................................... Universal Change to Figure 1 ............................................................................1 Updated Outline Dimensions ....................................................... 13 Added Ordering Guide .................................................................. 14 Rev. F | Page 2 of 16 Data Sheet AD590 SPECIFICATIONS AD590J AND AD590K SPECIFICATIONS 25C and VS = 5 V, unless otherwise noted. 1 Table 1. Parameter POWER SUPPLY Operating Voltage Range OUTPUT Nominal Current Output @ 25C (298.2 K) Nominal Temperature Coefficient Calibration Error @ 25C Absolute Error (Over Rated Performance Temperature Range) Without External Calibration Adjustment With 25C Calibration Error Set to Zero Nonlinearity For TO-52 and FLATPACK Packages For 8-Lead SOIC Package For 4-Lead LFCSP Package Repeatability 3 Long-Term Drift 4 Current Noise Power Supply Rejection 4 V VS 5 V 5 V VS 15 V 15 V VS 30 V Case Isolation to Either Lead Effective Shunt Capacitance Electrical Turn-On Time Reverse Bias Leakage Current (Reverse Voltage = 10 V) 5 Min AD590J 2 Typ Max 4 30 Min AD590K2 Typ Max 4 Unit 30 V 5.0 2.5 A A/K C 10 3.0 5.5 2.0 C C 1.5 1.5 1.5 0.1 0.1 0.8 1.0 298.2 1 298.2 1 40 40 C C C C C pA/Hz 0.5 0.2 0.1 1010 100 20 10 0.5 0.2 0.1 1010 100 20 10 A/V V/V A/V pF s pA 0.1 0.1 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 minimum and maximum specifications are guaranteed, although only those shown in boldface are tested on all production units. 2 The LFCSP and SOIC packages have a reduced operating temperature range of -40C to +125C. 3 Maximum deviation between +25C readings after temperature cycling between -55C and +150C; guaranteed, not tested. 4 Conditions: constant 5 V, constant 125C; guaranteed, not tested. 5 Leakage current doubles every 10C. 1 Rev. F | Page 3 of 16 AD590 Data Sheet AD590L AND AD590M SPECIFICATIONS 25C and VS = 5 V, unless otherwise noted. 1 Table 2. Parameter POWER SUPPLY Operating Voltage Range OUTPUT Nominal Current Output @ 25C (298.2 K) Nominal Temperature Coefficient Calibration Error @ 25C Absolute Error (Over Rated Performance Temperature Range) Without External Calibration Adjustment With 25C Calibration Error Set to Zero Nonlinearity Repeatability 2 Long-Term Drift 3 Current Noise Power Supply Rejection 4 V VS 5 V 5 V VS 15 V 15 V VS 30 V Case Isolation to Either Lead Effective Shunt Capacitance Electrical Turn-On Time Reverse Bias Leakage Current (Reverse Voltage = 10 V) 4 Min AD590L Typ Max 4 Min AD590M Typ Max 4 30 298.2 1 30 298.2 1 Unit V 40 40 A A/K C C C C C C C pA/Hz 0.5 0.2 0.1 1010 100 20 10 0.5 0.2 0.1 1010 100 20 10 A/V A/V A/V pF s pA 1.0 0.5 3.0 1.6 0.4 0.1 0.1 1.7 1.0 0.3 0.1 0.1 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 minimum and maximum specifications are guaranteed, although only those shown in boldface are tested on all production units. 2 Maximum deviation between +25C readings after temperature cycling between -55C and +150C; guaranteed, not tested. 3 Conditions: constant 5 V, constant 125C; guaranteed, not tested. 4 Leakage current doubles every 10C. K +223 C -50 F -100 +273 +298 +323 0 +25 0 +32 C= +50 +100 +70 +373 +423 +100 +150 +200 +212 5 ( F - 32) K = C + 273.15 9 9 F = C + 32 R = F + 459.7 5 Figure 5. Temperature Scale Conversion Equations Rev. F | Page 4 of 16 +300 00533-002 1 Data Sheet AD590 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Forward Voltage ( E+ or E-) Reverse Voltage (E+ to E-) Breakdown Voltage (Case E+ or E-) Rated Performance Temperature Range 1 Storage Temperature Range1 Lead Temperature (Soldering, 10 sec) 1 Rating 44 V -20 V 200 V -55C to +150C -65C to +155C 300C The AD590 was used at -100C and +200C for short periods of measurement with no physical damage to the device. However, the absolute errors specified apply to only the rated performance temperature range. Applicable to 2-lead FLATPACK and 3-pin TO-52 packages only. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ESD CAUTION Rev. F | Page 5 of 16 AD590 Data Sheet PRODUCT DESCRIPTION The AD590 is a 2-terminal temperature-to-voltage transducer. It is available in a variety of accuracy grades and packages. When using the AD590 in die form, the chip substrate must be kept electrically isolated (floating) for correct circuit operation. Figure 8 shows the typical V-I characteristic of the circuit at 25C and the temperature extremes. + 1725M Q2 Q1 R1 260 R2 1040 Q5 Q3 Q4 C1 26pF Q6 V- CHIP SUBSTRATE 00533-003 V+ Q12 Q7 Q9 Figure 6. Metallization Diagram Rev. F | Page 6 of 16 R4 11k Q10 Q11 R5 1 146 R6 820 1 - Figure 7. Schematic Diagram +150C 423 +25C 298 -55C 218 00533-005 In the AD590, this PTAT voltage is converted to a PTAT current by low temperature coefficient thin-film resistors. The total current of the device is then forced to be a multiple of this PTAT current. Figure 7 is the schematic diagram of the AD590. In this figure, Q8 and Q11 are the transistors that produce the PTAT voltage. R5 and R6 convert the voltage to current. Q10, whose collector current tracks the collector currents in Q9 and Q11, supplies all the bias and substrate leakage current for the rest of the circuit, forcing the total current to be PTAT. R5 and R6 are laser-trimmed on the wafer to calibrate the device at 25C. 8 IOUT (A) The AD590 uses a fundamental property of the silicon transistors from which it is made to realize its temperature proportional characteristic: if two identical transistors are operated at a constant ratio of collector current densities, r, then the difference in their base-emitter voltage is (kT/q)(In r). Because both k (Boltzman's constant) and q (the charge of an electron) are constant, the resulting voltage is directly proportional to absolute temperature (PTAT). (For a more detailed description, see M.P. Timko, "A Two-Terminal IC Temperature Transducer," IEEE J. Solid State Circuits, Vol. SC-11, p. 784-788, Dec. 1976. Understanding the Specifications-AD590.) R3 5k Q8 00533-004 1090M 0 1 2 3 4 5 SUPPLY VOLTAGE (V) Figure 8. V-I Plot 6 30 Data Sheet AD590 The AD590 is a PTAT current regulator. (Note that T (C) = T (K) - 273.2. Zero on the Kelvin scale is absolute zero; there is no lower temperature.) That is, the output current is equal to a scale factor times the temperature of the sensor in degrees Kelvin. This scale factor is trimmed to 1 A/K at the factory, by adjusting the indicated temperature (that is, the output current) to agree with the actual temperature. This is done with 5 V across the device at a temperature within a few degrees of 25C (298.2 K). The device is then packaged and tested for accuracy over temperature. CALIBRATION ERROR At final factory test, the difference between the indicated temperature and the actual temperature is called the calibration error. Since this is a scale factory error, its contribution to the total error of the device is PTAT. For example, the effect of the 1C specified maximum error of the AD590L varies from 0.73C at -55C to 1.42C at 150C. Figure 9 shows how an exaggerated calibration error would vary from the ideal over temperature. 5V + AD590 - R 100 - - ERROR VS. TEMPERATURE: CALIBRATION ERROR TRIMMED OUT Each AD590 is tested for error over the temperature range with the calibration error trimmed out. This specification could also be called the variance from PTAT, because it is the maximum difference between the actual current over temperature and a PTAT multiplication of the actual current at 25C. This error consists of a slope error and some curvature, mostly at the temperature extremes. Figure 11 shows a typical AD590K temperature curve before and after calibration error trimming. 2 BEFORE CALIBRATION TRIM CALIBRATION ERROR 0 AFTER CALIBRATION TRIM IDEAL TRANSFER FUNCTION 00533-008 IOUT (A) VT = 1mV/K Figure 10. One Temperature Trim IACTUAL 298.2 + 950 ACTUAL TRANSFER FUNCTION CALIBRATION ERROR + 00533-007 The way in which the AD590 is specified makes it easy to apply it in a wide variety of applications. It is important to understand the meaning of the various specifications and the effects of the supply voltage and thermal environment on accuracy. temperature range. In most applications, there is a current-tovoltage conversion resistor (or, as with a current input ADC, a reference) that can be trimmed for scale factor adjustment. ABSOLUTE ERROR (C) EXPLANATION OF TEMPERATURE SENSOR SPECIFICATIONS -2 -55 150 00533-006 TEMPERATURE (C) 298.2 TEMPERATURE (K) Figure 9. Calibration Error vs. Temperature The calibration error is a primary contributor to the maximum total error in all AD590 grades. However, because it is a scale factor error, it is particularly easy to trim. Figure 10 shows the most elementary way of accomplishing this. Figure 11. Effect to Scale Factor Trim on Accuracy ERROR VS. TEMPERATURE: NO USER TRIMS Using the AD590 by simply measuring the current, the total error is the variance from PTAT, described above, plus the effect of the calibration error over temperature. For example, the AD590L maximum total error varies from 2.33C at -55C to 3.02C at 150C. For simplicity, only the large figure is shown on the specification page. To trim this circuit, the temperature of the AD590 is measured by a reference temperature sensor and R is trimmed so that VT = 1 mV/K at that temperature. Note that when this error is trimmed out at one temperature, its effect is zero over the entire Rev. F | Page 7 of 16 AD590 Data Sheet NONLINEARITY Nonlinearity as it applies to the AD590 is the maximum deviation of current over temperature from a best-fit straight line. The nonlinearity of the AD590 over the -55C to +150C range is superior to all conventional electrical temperature sensors such as thermocouples, RTDs, and thermistors. Figure 12 shows the nonlinearity of the typical AD590K from Figure 11. TEMPERATURE (C) 2 0 00533-011 0.8 -2 -55 0 Figure 14. Typical 2-Trim Accuracy 0 VOLTAGE AND THERMAL ENVIRONMENT EFFECTS 0.8C MAX 0.8C MAX The power supply rejection specifications show the maximum expected change in output current vs. input voltage changes. The insensitivity of the output to input voltage allows the use of unregulated supplies. It also means that hundreds of ohms of resistance (such as a CMOS multiplexer) can be tolerated in series with the device. 00533-009 -0.8 -1.6 -55 150 TEMPERATURE (C) Figure 12. Nonlinearity Figure 13 shows a circuit in which the nonlinearity is the major contributor to error over temperature. The circuit is trimmed by adjusting R1 for a 0 V output with the AD590 at 0C. R2 is then adjusted for 10 V output with the sensor at 100C. Other pairs of temperatures can be used with this procedure as long as they are measured accurately by a reference sensor. Note that for 15 V output (150C), the V+ of the op amp must be greater than 17 V. Also, note that V- should be at least -4 V; if V- is ground, there is no voltage applied across the device. 15V 35.7k R1 2k 97.6k It is important to note that using a supply voltage other than 5 V does not change the PTAT nature of the AD590. In other words, this change is equivalent to a calibration error and can be removed by the scale factor trim (see Figure 11). The AD590 specifications are guaranteed for use in a low thermal resistance environment with 5 V across the sensor. Large changes in the thermal resistance of the sensor's environment change the amount of self-heating and result in changes in the output, which are predictable but not necessarily desirable. The thermal environment in which the AD590 is used determines two important characteristics: the effect of selfheating and the response of the sensor with time. Figure 15 is a model of the AD590 that demonstrates these characteristics. R2 5k 30pF TJ 27k OP177 AD590 V- JC CA TC 100mV/C VT = 100mV/C + P 00533-010 AD581 150 100 TEMPERATURE (C) 0.8C MAX CCH CC TA - Figure 15. Thermal Circuit Model Figure 13. 2-Temperature Trim Rev. F | Page 8 of 16 00533-012 ABSOLUTE ERROR (C) 1.6 Data Sheet AD590 (1) Table 4 gives the sum of JC and CA for several common thermal media for both the H and F packages. The heat sink used was a common clip-on. Using Equation 1, the temperature rise of an AD590 H package in a stirred bath at 25C, when driven with a 5 V supply, is 0.06C. However, for the same conditions in still air, the temperature rise is 0.72C. For a given supply voltage, the temperature rise varies with the current and is PTAT. Therefore, if an application circuit is trimmed with the sensor in the same thermal environment in which it is used, the scale factor trim compensates for this effect over the entire temperature range. Table 4. Thermal Resistance Medium Aluminum Block Stirred Oil2 Moving Air3 With Heat Sink Without Heat Sink Still Air With Heat Sink Without Heat Sink TFINAL TINITIAL JC + CA (C/Watt) H F 30 10 42 60 (sec) H F 0.6 0.1 1.4 0.6 45 115 - 190 5.0 13.5 - 10.0 191 480 - 650 108 60 - 30 1 is dependent upon velocity of oil; average of several velocities listed above. Air velocity @ 9 ft/sec. 3 The time constant is defined as the time required to reach 63.2% of an instantaneous temperature change. 1 2 Rev. F | Page 9 of 16 T(t) = TINITIAL + (TFINAL - TINITIAL) x (1 - e-t/) 00533-013 TJ - TA = P(JC + CA) The time response of the AD590 to a step change in temperature is determined by the thermal resistances and the thermal capacities of the chip, CCH, and the case, CC. CCH is about 0.04 Ws/C for the AD590. CC varies with the measured medium, because it includes anything that is in direct thermal contact with the case. The single time constant exponential curve of Figure 16 is usually sufficient to describe the time response, T (t). Table 4 shows the effective time constant, , for several media. SENSED TEMPERATURE As an example, for the TO-52 package, JC is the thermal resistance between the chip and the case, about 26C/W. CA is the thermal resistance between the case and the surroundings and is determined by the characteristics of the thermal connection. Power source P represents the power dissipated on the chip. The rise of the junction temperature, TJ, above the ambient temperature, TA, is 4 TIME Figure 16. Time Response Curve AD590 Data Sheet GENERAL APPLICATIONS Figure 17 shows a typical use of the AD590 in a remote temperature sensing application. The AD590 is used as a thermometer circuit that measures temperature from -55C to +150C, with an output voltage of 1 mV/K. Because the AD590 measures absolute temperature (its nominal output is 1 mA/K), the output must be offset by 273.2 mA to read out in degrees Celsius. R3 10k + AD590L #2 - - + R2 50k V- - IT 00533-014 1k 0.1% LOW TCR RESISTOR 1mV/k Figure 17. Variable Scale Display Connecting several AD590 units in series, as shown in Figure 18, allows the minimum of all the sensed temperatures to be indicated. In contrast, using the sensors in parallel yields the average of the sensed temperatures. Figure 20 is an example of a cold junction compensation circuit for a Type J thermocouple using the AD590 to monitor the reference junction temperature. This circuit replaces an ice-bath as the thermocouple reference for ambient temperatures between 15C and 35C. The circuit is calibrated by adjusting RT for a proper meter reading with the measuring junction at a known reference temperature and the circuit near 25C. Using components with the TCs as specified in Figure 20, compensation accuracy is within 0.5C for circuit temperatures between 15C and 35C. Other thermocouple types can be accommodated with different resistor values. Note that the TCs of the voltage reference and the resistors are the primary contributors to error. 7.5V IRON REFERENCE JUNCTION 15V + + - 5V - + + + + + + AD580 AD590 - + - - - AD590 - 333.3 (0.1%) + VT AVG - VOUT CU + MEASURING JUNCTION - 8.66k METER 00533-015 + VT MIN - - 52.3 RT 1k RESISTORS ARE 1%, 50ppm/C Figure 18. Series and Parallel Connection The circuit in Figure 19 demonstrates one method by which differential temperature measurements can be made. R1 and R2 can be used to trim the output of the op amp to indicate a desired temperature difference. For example, the inherent offset between the two devices can be trimmed in. If V+ and V- are radically different, then the difference in internal dissipation causes a differential internal temperature rise. This effect can be used to measure the ambient thermal resistance seen by the sensors in applications such as fluid-level detectors or anemometry. 00533-017 AD590 - CONSTANTAN AD590 AD590 10k (0.1%) (T1 - T2) x (10mV/C) + R4 10k Figure 19. Differential Measurements 7V IT OP177 R1 5M 00533-016 AD590L #1 - + IT AD590 V+ Figure 20. Cold Junction Compensation Circuit for Type J Thermocouple Rev. F | Page 10 of 16 Data Sheet AD590 V+ V+ AD581 OUT 10V V- RH + - RSET 2 7 - AD790 1 3 + RL C1 4 10k V+ 4mA = 17C 12mA = 25C 20mA = 33C + AD581 - VOUT GND Figure 22. Simple Temperature Control Circuit The voltage compliance and the reverse blocking characteristic of the AD590 allow it to be powered directly from 5 V CMOS logic. This permits easy multiplexing, switching, or pulsing for minimum internal heat dissipation. In Figure 23, any AD590 connected to a logic high passes a signal current through the current measuring circuitry, while those connected to a logic zero pass insignificant current. The outputs used to drive the AD590s can be employed for other purposes, but the additional capacitance due to the AD590 should be taken into account. 35.7k 30pF RT 5k + AD590 - OP177 - + 5k 500 12.7k 10k 10 V- 00533-018 0.01F HEATING ELEMENTS RB AD590 00533-019 Figure 21 is an example of a current transmitter designed to be used with 40 V, 1 k systems; it uses its full current range of 4 to 20 mA for a narrow span of measured temperatures. In this example, the 1 A/K output of the AD590 is amplified to 1 mA/C and offset so that 4 mA is equivalent to 17C and 20 mA is equivalent to 33C. RT is trimmed for proper reading at an intermediate reference temperature. With a suitable choice of resistors, any temperature range within the operating limits of the AD590 can be chosen. 5V Figure 21. 4 to 20 mA Current Transmitter + AD590 CMOS GATES + + + - - - - 1k (0.1%) 00533-021 Figure 22 is an example of a variable temperature control circuit (thermostat) using the AD590. RH and RL are selected to set the high and low limits for RSET. RSET could be a simple pot, a calibrated multiturn pot, or a switched resistive divider. Powering the AD590 from the 10 V reference isolates the AD590 from supply variations while maintaining a reasonable voltage (~7 V) across it. Capacitor C1 is often needed to filter extraneous noise from remote sensors. RB is determined by the of the power transistor and the current requirements of the load. Figure 23. AD590 Driven from CMOS Logic Rev. F | Page 11 of 16 AD590 Data Sheet range of -55C to +125C. The high temperature restriction of 125C is due to the output range of the op amps; output to 150C can be achieved by using a 20 V supply for the op amp. Figure 24 demonstrates a method of multiplexing the AD590 in the 2-trim mode (see Figure 13 and Figure 14). Additional AD590s and their associated resistors can be added to multiplex up to eight channels of 0.5C absolute accuracy over the temperature +15V 35.7k + 35.7k - 5k 2k 5k 97.6k 97.6k VOUT V+ S1 OP177 S2 DECODER/ DRIVER 27k 10mV/C -15V S8 AD7501 +15V -15V + + - - AD590L TTL/DTL TO CMOS INTERFACE EN AD590L BINARY CHANNEL SELECT -5V TO -15V Figure 24. 8-Channel Multiplexer Rev. F | Page 12 of 16 00533-023 AD581 2k Data Sheet AD590 OUTLINE DIMENSIONS 0.030 (0.76) TYP POSITIVE LEAD INDICATOR 0.019 (0.48) 0.017 (0.43) 0.015 (0.38) 0.093 (2.36) 0.081 (2.06) 0.055 (1.40) 0.050 (1.27) 0.045 (1.14) 0.500 (12.69) MIN 0.240 (6.10) 0.230 (5.84) 0.220 (5.59) 0.0065 (0.17) 0.0050 (0.13) 0.0045 (0.12) 0.210 (5.34) 0.200 (5.08) 0.190 (4.83) 0.050 (1.27) 0.041 (1.04) 0.015 (0.38) TYP Figure 25. 2-Lead Ceramic Flat Package [FLATPACK] (F-2) Dimensions shown in inches and (millimeters) 0.150 (3.81) 0.115 (2.92) 0.500 (12.70) MIN 0.250 (6.35) MIN 0.050 (1.27) T.P. 0.100 (2.54) T.P. 0.019 (0.48) 0.016 (0.41) 0.030 (0.76) MAX 0.048 (1.22) 0.028 (0.71) 3 0.195 (4.95) 0.178 (4.52) 0.021 (0.53) MAX 2 0.050 (1.27) T.P. 0.046 (1.17) 0.036 (0.91) 1 45 T.P. BASE & SEATING PLANE CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 26. 3-Pin Metal Header Package [TO-52] (H-03-1) Dimensions shown in inches and (millimeters) Rev. F | Page 13 of 16 022306-A 0.230 (5.84) 0.209 (5.31) 0.050 (1.27) MAX AD590 Data Sheet 5.00 (0.1968) 4.80 (0.1890) 5 1 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 0.50 (0.0196) 0.25 (0.0099) 45 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 012407-A 8 4.00 (0.1574) 3.80 (0.1497) Figure 27. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 1.65 1.55 1.45 2.10 2.00 1.90 0.80 REF 3 PIN 1 INDEX AREA EXPOSED PAD 0.50 0.40 0.30 TOP VIEW 0.80 0.75 0.70 SEATING PLANE 0.203 REF 0.35 0.30 0.25 0.05 MAX 0.00 MIN 1 2 BOTTOM VIEW 0.20 MIN 1.80 1.70 1.60 PIN 1 INDICATOR (R 0.15) FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATIONS SECTION OF THIS DATA SHEET. COPLANARITY 0.08 COMPLIANT TO JEDEC STANDARDS MO-229 Figure 28. 4-Lead Lead Frame Chip Scale Package [LFCSP_WD] 2.00 mm x 3.00 mm Body, Very Very Thin, Dual Lead (CP-4-1) Dimensions shown in millimeters Rev. F | Page 14 of 16 09-07-2010-B 3.10 3.00 2.90 4 Data Sheet AD590 ORDERING GUIDE Model 1, 2 AD590JF AD590JH AD590JR AD590JRZ AD590KF AD590KH AD590KR AD590KR-REEL AD590KRZ AD590KRZ-RL AD590LF AD590LH AD590MF AD590MH AD590JCHIPS AD590JCPZ-R5 AD590JCPZ-RL7 1 2 Temperature Range -55C to +150C -55C to +150C -40C to +125C -40C to +125C -55C to +150C -55C to +150C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -55C to +150C -55C to +150C -55C to +150C -55C to +150C -55C to +150C -40C to +125C -40C to +125C Package Description 2-Lead FLATPACK 3-Pin TO-52 8-Lead SOIC_N 8-Lead SOIC_N 2-Lead FLATPACK 3-Pin TO-52 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 2-Lead FLATPACK 3-Pin TO-52 2-Lead FLATPACK 3-Pin TO-52 Bare Die 4-Lead LFCSP_WD 4-Lead LFCSP_WD Z = RoHS Compliant Part. The AD590xF models and the AD590xH models are available in 883B. Rev. F | Page 15 of 16 Package Option F-2 H-03-1 R-8 R-8 F-2 H-03-1 R-8 R-8 R-8 R-8 F-2 H-03-1 F-2 H-03-1 H-03-1 CP-4-1 CP-4-1 Branding 7A 7A AD590 Data Sheet NOTES (c)2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00533-0-11/12(F) Rev. F | Page 16 of 16