TC7126ARCPL

ADCs/DACs - Special Purpose Overview

The TC7126ARCPL is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It integrates seven-segment decoders, digit drivers, voltage reference, and clock circuits to directly drive Liquid Crystal Displays (LCDs). The device operates on a single 9V battery with typical power dissipation of 500µW. Key electrical specifications include a resolution of 0.05%, low noise of 15µVP-P, and high input impedance of 10^12Ω. It features an internal reference with a typical temperature drift of 35ppm/°C and supports conversion rates up to 3 readings per second.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3-1/2 digit dual-slope ADC with direct LCD segment and backplane drivers
• Low power consumption: 500µW typical at 9V supply, suitable for battery operation
• High precision: 0.05% resolution, 15µVP-P noise, and 1pA typical input leakage current
• Internal voltage reference with low temperature drift (35ppm/°C typical for TC7126A)

ADCs/DACs - Special Purpose Applications

• Thermometry systems
• Bridge readouts for strain gauges and load cells
• Digital panel meters for voltage, current, ohms, power, and pH
• Digital scales and process monitors

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'ARCPL' against the manufacturer's package code table to confirm the 40-pin PDIP variant and commercial temperature range (0°C to +70°C). Ensure compatibility with existing PCB footprints for through-hole mounting. Check for end-of-life status or obsolescence notices from Microchip Technology before finalizing procurement plans.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7126A variant over the standard TC7126 if lower internal reference temperature drift (35ppm/°C vs 80ppm/°C) is required. Choose the CPL package code for 40-pin DIP through-hole assembly. Ensure external component values for integrating capacitors and resistors are selected based on the desired full-scale voltage (200mV or 2V) and conversion rate (1 or 3 readings/sec).

ADCs/DACs - Special Purpose Part Context

The TC7126A is part of the TC7126 family of 3-1/2 digit analog-to-digital converters. It serves as a drop-in replacement for legacy devices like the ICL7126 and TC7126, offering improved internal reference stability without requiring changes to external component values in existing designs. The ARCPL designation specifically identifies the commercial grade version in a 40-pin plastic dual in-line package.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7126A is functionally identical to the TC7126 but with improved reference drift. It is designed as a direct pin-compatible replacement for the ICL7126. No external component value changes are typically required when upgrading from these legacy parts to the TC7126A.