The TC14433/A is an analog-to-digital converter chip produced by Microchip Technology Inc. It has an accuracy of ±0.05%, two voltage ranges of 1.999V and 199.9 mV, a conversion speed of up to 25 times/second, an input resistance of more than 1000M ohms, a single positive voltage reference, auto-polarity and auto-zero calibration functions, support for overvoltage and undervoltage signals, and can operate in auto-ranging circuits. It can be used in portable instruments, digital multimeters, digital panel meters, digital scales, digital thermometers, remote A/D sensing systems and MPU systems.