TC7126CPL

ADCs/DACs - Special Purpose Overview

The TC7126CPL 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 LCDs. The device operates on a single 9V supply with typical power dissipation of 500µW. Key electrical specifications include a maximum input leakage current of 10pA, noise performance of 15µVP-P, and linearity error within ±1 count. It features an internal low-drift voltage reference (35ppm/°C typical for the A variant) 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
• High resolution: 0.05% accuracy with 15µVP-P noise
• Internal voltage reference with 35ppm/°C temperature drift (TC7126A)

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'CPL' corresponds to the 40-pin PDIP package and commercial temperature range (0°C to +70°C). Confirm whether the design requires the standard TC7126 or the improved TC7126A variant regarding reference drift. Check datasheet revision history for any pinout changes in legacy designs.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7126CPL for commercial temperature applications requiring through-hole mounting. Ensure external components like CINT and CAZ are selected based on the desired full-scale voltage (200mV or 2V) and conversion rate. Verify that the oscillator frequency meets noise rejection requirements for 50Hz or 60Hz power lines.

ADCs/DACs - Special Purpose Part Context

The TC7126CPL belongs to the TC7126/A family of integrating ADCs. It serves as a drop-in replacement for older ICL7126 designs but offers enhanced internal reference stability. The 'CPL' designation specifically identifies the plastic dual in-line package configuration suitable for general-purpose industrial instrumentation.

ADCs/DACs - Special Purpose Replacement Considerations

Functionally compatible with ICL7126. For improved temperature stability, consider the TC7126ACPL which features a lower reference drift coefficient of 35ppm/°C compared to the standard TC7126's 80ppm/°C.