TC7126CKW713

ADCs/DACs - Special Purpose Overview

The TC7126CKW713 is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) from Microchip Technology, housed in a 44-pin MQFP package. It integrates seven-segment decoders, digit drivers, an internal voltage reference, and clock circuits to directly drive LCDs. Key electrical specifications include a typical power supply current of 55 µA at 9V, a maximum power dissipation of 1.00 W, and an operating temperature range of 0°C to +70°C. The device features low noise performance of 15 µVP-P and high resolution of 0.05%.

ADCs/DACs - Special Purpose Feature Summary

• Internal Voltage Reference with Low Temperature Drift: 35ppm/°C typical for the TC7126A variant.
• Low Power Dissipation: Typical 500µW, enabling convenient 9V battery operation.
• High Resolution and Accuracy: 0.05% resolution with linearity error less than 1 count.
• Direct LCD Drive: Includes segment drivers and backplane driver for 3-1/2 digit displays.

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix '713' indicates reel packaging when sourcing. Confirm the device variant is TC7126A due to the specified 35ppm/°C drift characteristic. Ensure the 44-pin MQFP footprint matches the PCB design. Check humidity sensitivity handling requirements during assembly.

ADCs/DACs - Special Purpose Selection Notes

Select this component for portable applications requiring low power consumption and direct LCD interfacing. The TC7126A variant is preferred over TC7126 for better temperature stability (35ppm/°C vs 80ppm/°C). Ensure the external oscillator components support the desired conversion rate, typically 3 readings per second at 48kHz.

ADCs/DACs - Special Purpose Part Context

This part belongs to the TC7126/A family of dual-slope integrating ADCs. It serves as a drop-in replacement for older ICL7126 designs without requiring external component value changes. The CKW suffix denotes the 44-pin PQFP package suitable for surface mount applications.

ADCs/DACs - Special Purpose Replacement Considerations

Functionally identical to TC7126CKW. Verify if the 'A' suffix is required for the improved 35ppm/°C reference drift specification compared to the standard TC7126.

ADCs/DACs - Special Purpose FAQ

What is the typical input leakage current?

The typical input leakage current is 1pA, with a maximum of 10pA.

How does the device handle zero input?

It provides a true digital zero reading with zero input due to an auto-zero cycle that removes offset voltages.

What is the common mode rejection ratio?

The device offers a common mode rejection ratio of 86 dB.