LM19

LM19 NSC | Alldatasheet

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Technical content

Features

n Rated for full −55˚C to +130˚C range n Available in a TO-92 package n Predictable curvature error n Suitable for remote applications Key Specifications j Accuracy at +30˚C ±2.5 ˚C (max) j Accuracy at +130˚C & −55˚C ±3.5 to ±3.8 ˚C (max) j Power Supply Voltage Range +2.4V to +5.5V j Current Drain 10 µA (max) j Nonlinearity ±0.4 % (typ) j Output Impedance 160 Ω (max) j Load Regulation 0µ A < IL< +16 µA −2.5 mV (max) Typical Application Output Voltage vs Temperature 20004002 or where: T is temperature, and V O is the measured output voltage of the LM19. 20004024 FIGURE 1. Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C)

Typical Application (Continued) Temperature (T) Typical V O +130˚C +303 mV +100˚C +675 mV +80˚C +919 mV +30˚C +1515 mV +25˚C +1574 mV 0˚C +1863.9 mV −30˚C +2205 mV −40˚C +2318 mV −55˚C +2485 mV Connection Diagram TO-92 20004001 See NS Package Number Z03A

Ordering Information

Order Temperature Temperature NS Package Device Number Accuracy Range Number Marking Transport Media LM19CIZ ±3.8˚C −55˚C to +130˚C Z03A LM19CIZ Bulk LM19 www.national.com 2

Absolute Maximum Ratings (Note 1) Supply Voltage +6.5V to −0.2V Output Voltage (V + + 0.6 V) to −0.6 V Output Current 10 mA Input Current at any pin (Note 2) 5 mA Storage Temperature −65˚C to +150˚C Maximum Junction Temperature JMAX) +150˚C ESD Susceptibility (Note 3) : Human Body Model 2500 V Machine Model 250 V Lead Temperature Soldering (3 seconds dwell) +240˚C Operating Ratings(Note 1) Specified Temperature Range: TMIN ≤ TA ≤ TMAX Supply Voltage Range (V +) +2.4 V to +5.5 V Thermal Resistance, θJA(Note 4) TO-92 150˚C/W

Electrical Characteristics

Unless otherwise noted, these specifications apply for V + = +2.7 VDC. Boldface limits apply for T A =T J =T MIN to TMAX ; all other limits TA =T J = 25˚C; Unless otherwise noted. Parameter Conditions Typical (Note 5) LM19C Units (Limit)Limits (Note 6) Temperature to Voltage Error (Note 7) TA = +25˚C to +30˚C ±2.5 ˚C (max) TA = +130˚C ±3.5 ˚C (max) TA = +125˚C ±3.5 ˚C (max) TA = +100˚C ±3.2 ˚C (max) TA = +85˚C ±3.1 ˚C (max) TA = +80˚C ±3.0 ˚C (max) TA = 0˚C ±2.9 ˚C (max) TA = −30˚C ±3.3 ˚C (min) TA = −40˚C ±3.5 ˚C (max) TA = −55˚C ±3.8 ˚C (max) Output Voltage at 0˚C +1.8639 V Variance from Curve ±1.0 ˚C Non-Linearity (Note 8) −20˚C ≤ TA ≤ +80˚C ±0.4 % Sensor Gain (Temperature Sensitivity or Average Slope) to equation: V O=−11.77 mV/˚CxT+1.860V −12.6 mV/˚C (min) mV/˚C (max) Output Impedance 0 µA ≤ IL ≤ +16 µA (Notes 10, 11) 160 Ω (max) Load Regulation(Note 9) 0 µA ≤ IL ≤ +16 µA (Notes 10, 11) −2.5 mV (max) Line Regulation +2. 4 V ≤ V+ ≤ +5.0V +3.7 mV/V (max) Quiescent Current +2. 4 V ≤ V+ ≤ +5.0V 4.5 7 µA (max) Change of Quiescent Current +2. 4 V ≤ V+ ≤ +5.5V +0.7 µA Temperature Coefficient of −11 nA/˚C Quiescent Current Shutdown Current V + ≤ +0.8 V 0.02 µA LM19 www.national.com3

Electrical Characteristics (Continued) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characterist ics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the lis ted test conditions. Note 2: When the input voltage (V I) at any pin exceeds power supplies (V I < GND or VI > V+), the current at that pin should be limited to 5 mA. Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Note 4: The junction to ambient thermal resistance ( θJA) is specified without a heat sink in still air. Note 5: Typicals are at TJ =T A = 25˚C and represent most likely parametric norm. Note 6: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 7: Accuracy is defined as the error between the measured and calculated output voltage at the specified conditions of voltage, current, and temperature (expressed in˚C). Note 8: Non-Linearity is defined as the deviation of the calculated output-voltage-versus-temperature curve from the best-fit straight line, over the tem perature range specified. Note 9: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance. Note 10: Negative currents are flowing into the LM19. Positive currents are flowing out of the LM19. Using this convention the LM19 can at most sink −1 µA and source +16 µA. Note 11: Load regulation or output impedance specifications apply over the supply voltage range of +2.4V to +5.5V. Note 12: Line regulation is calculated by subtracting the output voltage at the highest supply input voltage from the output voltage at the lowest supply inputvoltage. Typical Performance Characteristics Temperature Error vs. Temperature Thermal Response in Still Air 20004034 20004035

1.0 LM19 Transfer Function

The LM19’s transfer function can be described in different ways with varying levels of precision. A simple linear transfer function, with good accuracy near 25˚C, is V O= −11.69 mV/˚C x T + 1.8663 V Over the full operating temperature range of −55˚C to +130˚C, best accuracy can be obtained by using the para- bolic transfer function V solving for T: A linear transfer function can be used over a limited tempera- ture range by calculating a slope and offset that give best results over that range. A linear transfer function can be calculated from the parabolic transfer function of the LM19. The slope of the linear transfer function can be calculated using the following equation: m = −7.76 x 10 −6x T − 0.0115, where T is the middle of the temperature range of interest and m is in V/˚C. For example for the temperature range of T min=−30 to T max=+100˚C: T=35˚C and m = −11.77 mV/˚C The offset of the linear transfer function can be calculated using the following equation: b=( V OP(Tmax)+V OP( T )+mx( T max+T))/2 where:  VOP(Tmax) is the calculated output voltage at T max using the parabolic transfer function for V O  VOP(T) is the calculated output voltage at T using the parabolic transfer function for V O. Using this procedure the best fit linear transfer function for many popular temperature ranges was calculated in Figure 2. As shown in Figure 2 the error that is introduced by the linear transfer function increases with wider temperature ranges. LM19 www.national.com 4

1.0 LM19 Transfer Function (Continued)

2.0 Mounting

ture to which the LM19’s leads are attached. will also affect the temperature that is being sensed. minimize the load current that the LM19 is required to drive. mal resistance for different conditions.

3.0 Capacitive Loads

range the LM19 has a maximum output impedance of 160Ω. Figure 5. A 1 µF output capacitor with the 160 Ω maximum will not be significantly affected. FIGURE 2. First Order Equations Optimized For Different Temperature Ranges. FIGURE 3. Temperature Rise of LM19 Due to FIGURE 4. LM19 No Decoupling Required for Capacitive Loads Less than 300 pF.

3.0 Capacitive Loads (Continued)

4.0 Applications Circuits

FIGURE 5. LM19 with Filter for Noisy Environment and Capacitive Loading greater than 300 pF. Either placement of resistor as shown above is just as effective. FIGURE 6. Centigrade Thermostat FIGURE 7. Conserving Power Dissipation with Shutdown

4.0 Applications Circuits (Continued)

is shown as an example only. If a digital output temperature is required please refer to devices such as the LM74. FIGURE 8. Suggested Connection to a Sampling Analog to Digital Converter Input Stage

Physical Dimensions inches (millimeters) unless otherwise noted 3-Lead TO-92 Plastic Package (Z) Order Number LM19CIZ LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Fax: 65-6250 4466 Email: ap.support@nsc.com Tel: 65-6254 4466 National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: nsj.crc@jksmtp.nsc.com Tel: 81-3-5639-7560 www.national.com LM19 2.4V, 10µA, TO-92 Temperature Sensor National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the righ t at any time without notice to change said circuitry and specifications.