TC14433

1 TC14433 TC14433A 3-1/2 DIGIT A/D CONVERTERS FEATURES s Accuracy ................... ±0.05% of Reading ±1 Count s Two Voltage Ranges ............. 1.999V and 199.9 mV s Up to 25 Conversions Per Second s ZIN > 1000M Ohms s Single Positive Voltage Reference s Auto-Polarity and Auto-Zero s Overrange and Underrange Signals Available s Operates in Auto-Ranging Circuits s Uses On-Chip System Clock or External Clock s Wide Supply Range .................... e.g., ±4.5V to ±8V s Package Available .................................. 24-Pin DIP 24-Pin CerDIP, 28-Pin SOIC and 28-Pin PLCC APPLICATIONS s Portable Instruments s Digital Voltmeters s Digital Panel Meters s Digital Scales s Digital Thermometers s Remote A/D Sensing Systems s MPU Systems s See Application Notes 19 and 21 FUNCTIONAL BLOCK DIAGRAM RC 10 11 CLK1 CLK0 MULTIPLEXER LATCHES 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 dualslope 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. The TC14433 will interface with the TC7211A LCD display driver. T...