LM45 Datasheet | National Semiconductor

LM45 SOT-23 Precision Centigrade Temperature Sensors July 1999 LM45 SOT-23 Precision Centigrade Temperature Sensors General Description The LM45 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM45 does not require any external calibration or trimming to provide accuracies of ± 2˚C at room temperature and ± 3˚C over a full - 20 to +100˚C temperature range. Low cost is assured by trimming and calibration at the wafer level. The LM45’s low output impedance, linear output, and precise inherent calibration make interfacing to readout or control circuitry especially easy. It can be used with a single power supply, or with plus and minus supplies. As it draws only 120 µA from its supply, it has very low self-heating, less than 0.2˚C in still air. The LM45 is rated to operate over a - 20˚ to +100˚C temperature range. n n n n n n Portable Medical Instruments HVAC Power Supply Modules Disk Drives puters Automotive Features n n n n n n n n n n n Calibrated directly in ˚ Celsius (Centigrade) Linear + 10.0 m V/˚C scale factor ± 3˚C accuracy guaranteed Rated for full - 20˚ to +100˚C range Suitable for remote applications Low cost due to wafer-level trimming Operates from 4.0V to 10V Less than 120 µA current drain Low self-heating, 0.20˚C in still air Nonlinearity only ± 0.8˚C max over temp Low impedance output, 20Ω for 1 m A load Applications n Battery Management n FAX Machines n Printers Connection Diagram SOT-23 Order Number LM45BIM3 LM45BIM3X LM45CIM3 LM45CIM3X DS011754-1 SOT-23 Device Marking T4B T4B T4C T4C Supplied As 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel Top View See NS Package Number MA03B Typical Applications DS011754-3 FIGURE 1. Basic Centigrade Temperature Sensor (+2.5˚C to +100˚C) DS011754-4 Choose R1 = - VS/50 µA VOUT = (10 m V/˚C x Temp ˚C) VOUT = +1,000 m V at +100˚C = +250 m V at...