TC14433

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

Application

Portable Instruments
Digital Voltmeters
Digital Panel Meters
Digital Scales
Digital Thermometers
Remote A/D Sensing Systems
MPU Systems
See Application Notes 19 and 21

Specifications

Parameter NameValueSupply Voltage (V)4.5 to ±, 8Input Voltage Range (V)199.9 mV to 1.999DMMYesMax Power (mW)20Resolution (Digits)3Resolution (Counts)2000InterfaceMUXed BCDTemp Range (°C)-40 to +85Device DescriptionBCD A/D

Supply Voltage (VDD VEE) ...................... 0.5V to +18V
Voltage on Any Pin,
Reference to VEE ....................... ...... 0.5V to (VDD + 0.5)
DC Current, Any Pin.............................................. ...±10mA
Operating Temperature Range .............. 40°C to +85
Power Dissipation (TA < 70)
Plastic PLCC ................................................................1.0W
Plastic DIP ...............................................................940mW
SOIC.........................................................................940mW
CerDIP .......................................................................1.45W
Storage Temperature Range ............... 65°C to +160°C
Lead Temperature (Soldering, 10 sec) ................. .+300°C
*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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 TC14433 will interface with the TC7211A LCD display driver. The TC14433A features improved performance over the industry standard TC14433.Rollover, which is the measurement of identical positive and negative signals, is guaranteed to have the same reading within one count for the TC14433A.Power consumption of the TC14433A is typically 4 mW,approximately one-half that of the industry standard TC14433.