TC7106ACLW713

ADCs/DACs - Special Purpose Overview

The TC7106ACLW713 is a low-power, 3-1/2 digit CMOS analog-to-digital converter (ADC) manufactured by Microchip Technology. It features a dual-slope conversion architecture with an internal precision reference exhibiting a typical temperature drift of 20 ppm/°C. The device provides high resolution (0.05%) and low noise performance (15 µV peak-to-peak). It includes high-impedance differential inputs with 1 pA leakage current and drives LCD displays directly. Key electrical parameters include a supply voltage range of 9V for battery operation, power dissipation of 10 mW, and a full-scale input range of 200 mV or 2.0 V.

ADCs/DACs - Special Purpose Feature Summary

• Internal Reference: Features a low temperature drift internal reference (20 ppm/°C typical for the 'A' variant), eliminating the need for external precision references.
• Direct Display Drive: Contains segment drivers to directly drive a 3-1/2 digit LCD display without additional logic components.
• Auto-Zero Cycle: Incorporates an auto-zero cycle that eliminates offset voltage errors, ensuring a true zero reading with zero input.
• High Input Impedance: Offers high-impedance CMOS differential inputs with 10^12 Ω impedance and 1 pA typical leakage current.

ADCs/DACs - Special Purpose Applications

• Thermometry
• Bridge Readouts (Strain Gauges, Load Cells)
• Digital Meters (Voltage, Current, Ohms, Power, pH)
• Portable Instrumentation

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type corresponds to the ordering suffix; the 'LW' suffix indicates a 44-pin PLCC package. Confirm the temperature grade ('C' for commercial 0°C to +70°C) matches the application requirements. Ensure the specific revision of the datasheet (DS21455D) is referenced for final design validation.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7106A over the standard TC7106 when improved temperature stability is required due to its lower reference drift (20 ppm/°C vs 80 ppm/°C). Choose this component for applications requiring direct LCD driving and low power consumption suitable for 9V battery operation. Ensure the external integrating capacitor and resistor values are selected based on the desired full-scale voltage (200 mV or 2.0 V) and clock frequency.

ADCs/DACs - Special Purpose Part Context

The TC7106A is part of the TC7106/A/TC7107/A family of 3-1/2 digit ADCs. It serves as a drop-in replacement for the TC7106, allowing system upgrades without changing external passive component values. While the TC7106 drives LCDs, the TC7107A variant drives LEDs. The TC7106A specifically targets portable, battery-powered instrumentation where low power drain and high accuracy are critical.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7106A is a direct upgrade for the TC7106 with no external component changes required. For LED display applications, the TC7107A is the corresponding alternative within the same package and pinout configuration.