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: ±4.5V to ±8V

Applications

• Portable Instruments

• Digital Voltmeters

• Digital Panel Meters

• Digital Scales

• Digital Thermometers

• Remote A/D Sensing Systems

• MPU Systems

Device Selection Table

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.

The TC14433A features improved performance over the industry standard TC14433. Rollover, which is the measurement of identical positive and negative signals, is specified to have the same reading within one count for the TC14433A. Power consumption of the TC14433A is typically 4mW, approximately onehalf that of the industry standard TC14433.

The TC14433/A is available in 24-Pin PDIP, 24-Pin CERDIP, 24-Pin SOIC (TC14433 device only), and 28-Pin PLCC packages.

Typical Application

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