TC7126CLW713

ADCs/DACs - Special Purpose Overview

The TC7126CLW713 is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It integrates seven-segment decoders, digit drivers, an internal voltage reference, and clock circuits to directly drive Liquid Crystal Displays (LCDs). The device features a dual-slope conversion architecture with high resolution of 0.05% and low noise performance of 15µV P-P. It operates on a single 9V battery supply with typical power dissipation of 500µW. The component is housed in a 44-pin PLCC package and supports a commercial operating temperature range from 0°C to +70°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3-1/2 digit ADC with direct LCD segment and backplane drivers
• Low input leakage current of 1pA typical and 10pA maximum
• Internal voltage reference with 35ppm/°C typical temperature drift
• High common-mode rejection ratio for noise immunity

ADCs/DACs - Special Purpose Applications

• Thermometry systems
• Bridge readouts including strain gauges and load cells
• Digital panel meters for voltage, current, and resistance measurement
• Digital scales and process monitors

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix '713' against official Microchip documentation to confirm reel packaging specifications. Ensure compatibility with the 44-pin PLCC footprint during PCB layout. Confirm that the commercial temperature grade meets the operational requirements of the target environment.

ADCs/DACs - Special Purpose Selection Notes

Select this model for applications requiring low-power battery operation and direct LCD interfacing without external decoding logic. The TC7126A variant offers superior internal reference stability compared to the standard TC7126. Ensure external component values for the integrating capacitor and oscillator resistor are calculated based on the desired conversion rate and full-scale input voltage.

ADCs/DACs - Special Purpose Part Context

This component belongs to the TC7126 family of dual-slope integrating ADCs. It serves as a drop-in replacement for legacy devices like the ICL7126. The 'CLW' package code denotes the 44-pin Plastic Leaded Chip Carrier form factor. The 'A' designation indicates the improved internal reference temperature coefficient characteristic of this specific part number.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7126A is functionally identical to the TC7126 but provides a lower internal reference drift of 35ppm/°C versus 80ppm/°C. No external component value changes are required when upgrading existing designs from the TC7126 to the TC7126A.