TC7126ACPL

The TC7126ACPL from Microchip Technology is a versatile 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) that integrates all necessary components for a 0.05% resolution measurement system. It includes seven-segment decoders, digit and polarity drivers, a voltage reference, and a clock circuit on a single chip, directly driving a Liquid Crystal Display (LCD).

Key electrical specifications include a low noise of 15 µVP-P, low input leakage current of 1pA typical, and a high input impedance of 1 TΩ typical. The device operates efficiently on a 9V battery, consuming only 500 µW typically, making it suitable for portable applications. The internal reference exhibits low temperature drift, with the TC7126A variant offering 35ppm/°C typical.

Applications for the TC7126ACPL include thermometry, bridge readouts for strain gauges and load cells, and various digital meters for voltage, current, ohms, power, and pH measurements. Its auto-zero cycle ensures a zero display reading with zero input, and it reduces linearity error to less than 1 count.

Packaged in a 40-PDIP through-hole configuration, the TC7126ACPL operates within a temperature range of 0°C to 70°C. It is designed for ease of use, requiring only a display, four resistors, and four capacitors to build a complete indicating meter.