TC7116ACLW

ADCs/DACs - Special Purpose Overview

The TC7116ACLW is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It features a dual-slope conversion architecture with 13-bit resolution and a single analog input channel. The device integrates seven-segment decoders, polarity drivers, a voltage reference, and clock circuits to drive LCD displays directly. Key electrical parameters include a typical supply current of 0.8 mA at 9 V, a peak-to-peak noise of 15 µV, and an input impedance of 10^12 Ω. It operates within a commercial temperature range of 0°C to +70°C.

ADCs/DACs - Special Purpose Feature Summary

• Low Temperature Drift Internal Reference: 20 ppm/°C typical for the 'A' variant
• Display Hold Function: Maintains reading indefinitely while HLDR is high
• Direct LCD Drive: Includes backplane driver for segment and common signals
• Auto-Zero Cycle: Eliminates offset drift without external adjustment potentiometers

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 CLW corresponds to the 44-pin PLCC form factor. Confirm the temperature grade matches the commercial requirement of 0°C to +70°C. Ensure the specific suffix aligns with the intended display interface, as this model drives LCDs rather than LEDs. Check for RoHS compliance status in the latest datasheet revision.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7116ACLW when an LCD display is required instead of an LED. Choose this over the TC7116 if lower internal reference drift (20 ppm/°C vs 80 ppm/°C) is necessary. Ensure the application supports a 9V supply or appropriate level shifting. Verify that the 44-pin PLCC footprint fits the PCB layout constraints.

ADCs/DACs - Special Purpose Part Context

This component belongs to the TC7116/A family of 3-1/2 digit ADCs. It is functionally identical to the TC7116 but offers improved internal reference stability. The 'CLW' suffix denotes the 44-pin Plastic Leaded Crystal Carrier (PLCC) package suitable for surface mount applications.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitutes include the TC7116CPL for PDIP packaging variants. Cross-family replacements like the ICM7224IPL+ are listed as similar devices by distributors.