TC7107ACKW

ADCs/DACs - Special Purpose Overview

The TC7107ACKW is a Microchip Technology 3½-digit dual-slope integrating analog-to-digital converter (ADC) designed for direct LED display driving. It features an internal precision voltage reference with a maximum temperature coefficient of 20 ppm/°C, offering improved stability over standard counterparts. The device operates on a single 5V supply and provides high-impedance differential inputs with 1 pA leakage current and 10^12 Ω impedance. It drives common-anode LEDs directly with 8 mA per segment and includes an auto-zero cycle to eliminate offset errors. Key electrical specifications include a typical noise performance of 15 µV peak-to-peak and a linearity error of less than ±1 count.

ADCs/DACs - Special Purpose Feature Summary

• Directly drives common-anode LED displays with 8 mA segment sinking current
• Internal precision reference with 20 ppm/°C maximum temperature coefficient
• High-impedance CMOS differential inputs (10^12 Ω, 1 pA leakage)
• Auto-zero cycle ensures zero reading with zero input without external adjustment

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type MQFP-44 and commercial temperature range (0°C to +70°C) against design requirements. Confirm that the 5V supply voltage aligns with the system power architecture. Ensure PCB layout accommodates the specific pinout for the MQFP package to maintain signal integrity for the high-impedance analog inputs.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a direct LED interface is required without additional driver circuitry. The TC7107ACKW is suitable for applications needing ratiometric measurements via differential reference inputs. Consider the 3 readings per second conversion rate at 48 kHz clock frequency. Verify that the 8 mA drive current meets the LED brightness requirements for the specific display unit used.

ADCs/DACs - Special Purpose Part Context

The TC7107ACKW belongs to the TC7106/A/TC7107/A family of 3½-digit ADCs. It serves as a drop-in replacement for the TC7107, allowing upgrades to existing systems without changing external passive component values. The 'A' suffix denotes the enhanced low-drift internal reference, while 'KW' indicates the MQFP surface-mount package and commercial temperature grade.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7107CKW is a verified substitute within the same family, sharing identical electrical characteristics but differing in packaging or temperature rating.