TC7107CLW

ADCs/DACs - Special Purpose Overview

The TC7107CLW is a 3-1/2 digit Analog-to-Digital Converter (ADC) manufactured by Microchip Technology, housed in a 44-pin PLCC package. It features an internal reference with a typical temperature drift of 80 ppm/°C and drives common anode LED displays directly with 8 mA per segment. The device operates on a single +5V supply with a maximum power consumption of 10 mW. Key electrical characteristics include high-impedance CMOS differential inputs with 10^12 Ω impedance, 15 µV peak-to-peak noise performance, and a conversion rate of 3 readings per second at a 48 kHz clock frequency.

ADCs/DACs - Special Purpose Feature Summary

• Directly drives common anode LED displays with 8 mA segment sinking current capability.
• Dual-slope integrating architecture with auto-zero cycle for zero adjustment elimination.
• High input impedance of 10^12 Ω with low leakage current of 1 pA.
• Low power operation consuming approximately 10 mW.

ADCs/DACs - Special Purpose Applications

• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells, Null Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'CLW' corresponds to the Commercial temperature range (0°C to +70°C) and the 44-pin PLCC package format. Confirm that the component is sourced from authorized Microchip Technology distributors to ensure authenticity and adherence to RoHS standards.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a direct LED display interface is required without external drivers. Ensure the application utilizes a common anode LED configuration. For industrial environments requiring extended temperature ranges (-25°C to +85°C), consider the TC7107AIPL variant instead.

ADCs/DACs - Special Purpose Part Context

This part belongs to the TC7106/A/TC7107/A family of 3-1/2 digit ADCs. It serves as a drop-in replacement for legacy TC7107 parts, offering improved linearity error reduction to less than 1 count and lower rollover error below ±1 count while maintaining compatibility with existing passive component values.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers include TC7107CKW (MQFP-44 package) and TC7107CLWTR (Tape & Reel version of the CLW package). Verify pinout compatibility if substituting between different package types such as PDIP or MQFP.

ADCs/DACs - Special Purpose FAQ

What is the maximum segment sinking current for the TC7107CLW?

The TC7107CLW provides a typical segment sinking current of 8 mA per segment, with Pin 19 capable of sinking up to 16 mA to drive two segments simultaneously.

How does the TC7107CLW handle offset voltage errors?

It incorporates an auto-zero cycle that disconnects the differential input and shorts internal nodes to analog common. This loop compensates for comparator and integrator offset voltages, eliminating the need for external zero adjustment potentiometers.

What oscillator components are recommended for a 48 kHz clock frequency?

For a 48 kHz clock frequency, connect Pin 40 to the junction of a 100 kΩ resistor tied to Pin 39 and a 100 pF capacitor tied to Pin 38.