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GENERAL DESCRIPTION

The TC14433 is a low power, high-performance, monolithic CMOS 3-1/2 digit A/D converter. The TC14433 combines both analog and digital circuits on a single IC, thus minimizing the number of external components. This dual slope A/D converter provides automatic polarity and zero correction with the addition of two external resistors and two capacitors. The full-scale voltage range of this ratiometric IC extends from 199.9 millivolts to 1.999 volts. The TC14433 can operate over a wide range of power supply voltages, including batteries and standard 5-volt supplies.

FEATURES

■ Accuracy ...................±0.05 of Reading ±1 Count

■ Two Voltage Ranges .............1.999V and 199.9 mV

■ Up to 25 Conversions Per Second

■ ZIN> 1000M Ohms

■ Single Positive Voltage Reference

■ Auto-Polarity and Auto-Zero

■ Overrange and Underrange Signals Available

■ Operates in Auto-Ranging Circuits

■ Uses On-Chip System Clock or External Clock

■ Wide Supply Range .................... e.g., ±4.5V to ±8V

■ Package Available .................................. 24-Pin DIP

24-Pin CerDIP, 28-Pin SOIC and 28-Pin PLCC

APPLICATIONS

■ Portable Instruments

■ Digital Voltmeters

■ Digital Panel Meters

■ Digital Scales

■ Digital Thermometers

■ Remote A/D Sensing Systems

■ MPU Systems

■ See Application Notes 19 and 21