LM45B Datasheet | National Semiconductor

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 g 2 C at room temperature and g 3 C over a full b 20 to a 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 m A 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 b20 to a 100 C temperature range Y Y Y Y Y Y Portable Medical Instruments HVAC Power Supply Modules Disk Drives puters Automotive Features Y Y Y Y Y Y Y Applications Battery Management FAX Machines Printers Calibrated directly in Celsius (Centigrade) Linear a 10 0 m V C scale factor g 3 C accuracy guaranteed Rated for full b20 to a 100 C range Suitable for remote applications Low cost due to wafer-level trimming Operates from 4 0V to 10V Less than 120 m A current drain Low self-heating 0 20 C in still air Nonlinearity only g 0 8 C max over temp Low impedance output 20X for 1 m A load Connection Diagram SOT-23 Order Number LM45BIM3 LM45BIM3X TL H 11754 - 1 SOT-23 Device Marking T4B T4B T4C T4C Supplied As 250 Units on Tape and Reel 3000 Units on Tape and Reel 250 Units on Tape and Reel 3000 Units on Tape and Reel Top View See NS Package Number M03B (JEDEC Registration TO-236AB) LM45CIM3 LM45CIM3X Typical Applications TL H 11754 - 3 FIGURE 1 Basic Centigrade Temperature Sensor ( a 2 5 C to a 100 C) Choose R1 e b VS 50 m A VOUT e (10 m V C c Temp C) VOUT e a 1 000 m V at a 100 C e a 250 m V at a 25 C e b 200 m V at b 20 C TL H 11754 - 4 FIGURE 2 Full-Range Centigrade Temperature Sensor (b20 C to a 100...