TC7117ACKW

ADCs/DACs - Special Purpose Overview

The TC7117ACKW 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. This specific variant drives common anode LED displays directly with an 8mA segment drive current. Key electrical characteristics include a typical noise performance of 15µV peak-to-peak at a 200mV full-scale range, high-impedance differential inputs with 1pA leakage current, and a low temperature drift internal reference of 20 ppm/°C for the 'A' grade device.

ADCs/DACs - Special Purpose Feature Summary

• Directly drives common anode LED displays with 8mA segment sinking current
• Integrated display hold function maintains reading indefinitely while conversions continue
• Low temperature drift internal reference: 20 ppm/°C typical for TC7117A
• Auto-zero cycle eliminates need for external zero adjustment potentiometer

ADCs/DACs - Special Purpose Applications

• Thermometry systems
• Bridge readouts for strain gauges and load cells
• Digital meters including voltage, current, ohms, and power measurements
• Portable instrumentation requiring low-power operation

ADCs/DACs - Special Purpose Procurement Notes

Verify that the ordering suffix 'KW' corresponds to the 44-Pin PQFP package with a commercial temperature range of 0°C to +70°C. Confirm that the 'A' designation indicates the lower temperature drift specification (20 ppm/°C) compared to the standard TC7117. Ensure the application design accounts for the direct LED drive capability and power dissipation limits associated with driving multiple segments simultaneously.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7117ACKW when a common anode LED display interface is required, as opposed to the LCD-capable TC7116ACKW. The 'A' suffix is necessary for applications demanding tighter thermal stability (20 ppm/°C vs 80 ppm/°C). The 44-pin PQFP package is suitable for surface-mount assembly. Note that the device typically operates from ±5V supplies, though single-supply configurations are possible with specific input referencing.

ADCs/DACs - Special Purpose Part Context

The TC7117ACKW belongs to the TC7116/A and TC7117/A family of 3-1/2 digit dual-slope integrating ADCs. It is functionally identical to the TC7117CKW but utilizes a Plastic Quad Flat Package (PQFP) instead of PLCC. The 'A' version offers improved thermal stability over the base TC7117 model. It serves as a complete solution for digital panel meters by integrating all necessary analog and digital logic components on a single chip.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: TC7117CKW (PLCC package), TC7117CLW (PLCC package), TC7117CPL (PDIP package). These variants share identical electrical specifications and functionality, differing only in package type and pinout geometry.