TC7116CKW

ADCs/DACs - Special Purpose Overview

The TC7116CKW is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It integrates seven-segment decoders, polarity and digit drivers, a voltage reference, and clock circuitry to construct a measurement system with 0.05% resolution. The device features a display hold function, directly drives LCD displays, and includes a backplane driver. Key electrical specifications include a supply voltage range of 9V, power dissipation of 1W, and an operating temperature range from 0°C to +70°C. It utilizes a dual-slope conversion method with high-impedance differential inputs.

ADCs/DACs - Special Purpose Feature Summary

• Integrated internal reference with low temperature drift (80 ppm/°C typical)
• Display Hold (HLDR) function for indefinite reading retention
• Directly drives LCD or LED displays with integrated segment and backplane drivers
• High-impedance CMOS differential inputs with 1pA typical leakage current

ADCs/DACs - Special Purpose Applications

• Thermometry systems
• Bridge readouts for strain gauges and load cells
• Digital meters for voltage, current, ohms, and power
• Portable instrumentation powered by 9V batteries

ADCs/DACs - Special Purpose Procurement Notes

Verify the package code CKW corresponds to the 44-Pin PQFP configuration. Confirm the commercial temperature grade (0°C to +70°C) matches the application requirements. Ensure the specific suffix indicates the standard TC7116 variant rather than the lower-drift TC7116A if that distinction is critical for the design.

ADCs/DACs - Special Purpose Selection Notes

Select this component for applications requiring direct LCD driving without external multiplexing logic. The TC7116 is optimized for 9V battery operation. For designs requiring lower reference drift, consider the TC7116A variant which offers 20 ppm/°C typical drift. Ensure the PCB layout accommodates the 44-pin PQFP footprint and provides adequate thermal relief for the specified 1W power dissipation rating.

ADCs/DACs - Special Purpose Part Context

The TC7116CKW belongs to the TC7116/A family of 3-1/2 digit ADCs. It is functionally identical to the TC7116 but packaged in a 44-pin PQFP format. This family shares architecture with the TC7117 series, which drives LEDs instead of LCDs. The 'C' designation indicates the commercial temperature range, while 'K' denotes the PQFP package type.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: TC7116CLW (PLCC-44), TC7116ACKW (Lower drift version, PQFP-44).

ADCs/DACs - Special Purpose FAQ

How does the Display Hold function operate?

When the HLDR pin is held high, the displayed reading remains indefinitely. Conversions continue internally, but the output data display latches are not updated until HLDR returns to low.

What is the input impedance of the TC7116CKW?

The device features high-impedance CMOS differential inputs with a typical leakage current of 1pA and an input impedance of approximately 10^12 Ohms.

Can the TC7116 drive both LCD and LED displays?

No, the TC7116 specifically drives Liquid Crystal Displays (LCDs) and includes a backplane driver. The TC7117 variant is designed to drive common anode Light Emitting Diode (LED) displays directly.