LM34 - LM34 Precision Fahrenheit Temperature Sensors...

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LM34 Precision Fahrenheit Temperature Sensors General Description The LM34 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Fahrenheit temperature. The LM34 thus has an advantage over linear temperature sensors calibrated in degrees Kelvin, as the user is not required to subtract a large con- stant voltage from its output to obtain convenient Fahrenheit scaling. The LM34 does not require any external calibration or trimming to provide typical accuracies of ± 1 / 2 ˚F at room temperature and ±1 1 / 2 ˚F over a full -50 to +300˚F tempera- ture range. Low cost is assured by trimming and calibration at the wafer level. The LM34’s low output impedance, linear output, and precise inherent calibration make interfacing to readout or control circuitry especially easy. It can be used with single power supplies or with plus and minus supplies. As it draws only 75 μA from its supply, it has very low self-heating, less than 0.2˚F in still air. The LM34 is rated to operate over a -50˚ to +300˚F temperature range, while the LM34C is rated for a -40˚ to +230˚F range (0˚F with im- proved accuracy). The LM34 series is available packaged in hermetic TO-46 transistor packages, while the LM34C, LM34CA and LM34D are also available in the plastic TO-92 transistor package. The LM34D is also available in an 8-lead surface mount small outline package. The LM34 is a comple- ment to the LM35 (Centigrade) temperature sensor. Features n Calibrated directly in degrees Fahrenheit n Linear +10.0 mV/˚F scale factor n 1.0˚F accuracy guaranteed (at +77˚F) n Rated for full -50˚ to +300˚F range n Suitable for remote applications n Low cost due to wafer-level trimming n Operates from 5 to 30 volts n Less than 90 μA current drain n Low self-heating, 0.18˚F in still air n Nonlinearity only ±0.5˚F typical n Low-impedance output, 0.4 for 1 mA load Connection Diagrams Note 1: Case is connected to negative pin (GND). TO-46 Metal Can Package (Note 1) DS006685-1 Order Numbers LM34H, LM34AH, LM34CH, LM34CAH or LM34DH See NS Package Number H03H TO-92 Plastic Package DS006685-2 Order Number LM34CZ, LM34CAZ or LM34DZ See NS Package Number Z03A SO-8 Small Outline Molded Package DS006685-20 N.C. = No Connection Top View Order Number LM34DM See NS Package Number M08A November 2000 LM34 Precision Fahrenheit Temperature Sensors © 2000 National Semiconductor Corporation DS006685 www.national.com
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Typical Applications DS006685-3 FIGURE 1. Basic Fahrenheit Temperature Sensor (+5˚ to +300˚F) DS006685-4 FIGURE 2. Full-Range Fahrenheit Temperature Sensor LM34 www.national.com 2
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Absolute Maximum Ratings (Note 11) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage
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LM34 - LM34 Precision Fahrenheit Temperature Sensors...

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