ICL7129ACPL+

ADCs/DACs - Special Purpose Overview

The ICL7129ACPL+ is a low-noise, single-chip analog-to-digital converter (ADC) with an integrated multiplexed LCD driver. It provides 4 1/2-digit resolution and utilizes continuous integration technology to achieve high accuracy without external auto-zero capacitors. The device operates on a single power supply ranging from 6V to 14V, with a maximum power dissipation of 800 mW. It features a high-impedance differential input, automatic polarity detection, and direct drive capability for 4 1/2-digit displays with three annunciators. The component is housed in a 40-pin PDIP package and functions within a commercial temperature range of 0°C to +70°C.

ADCs/DACs - Special Purpose Feature Summary

• 4 1/2-digit resolution with ±19,999 count capability
• Integrated multiplexed LCD driver for direct display connection
• Continuous integration technique eliminates need for external auto-zero capacitors
• Low input bias current of 10pA typical

ADCs/DACs - Special Purpose Applications

• Precision digital voltmeters (DVM)
• Digital panel meters (DPM)
• Battery-operated instrumentation systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'CPL+' against the manufacturer's datasheet to confirm pinout compatibility and RoHS status. Check for discontinuation notices or end-of-life notifications from Analog Devices/Maxim Integrated, as this component family may have limited availability. Confirm that the 40-PDIP package matches the target PCB footprint requirements.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a single-chip solution for high-resolution DC voltage measurement is required. Ensure the application supports the 6V to 14V single-supply operation. Verify that the internal LCD driver capacity meets the segment and common requirements of the target display module. Consider the 800 mW power dissipation limit for thermal management in enclosed designs.

ADCs/DACs - Special Purpose Part Context

The ICL7129 series belongs to the Maxim Integrated line of integrating ADCs. It is part of a family that includes variants like the MAX7129 and ICL7129A. These devices are designed to replace traditional dual-slope converters by offering higher resolution and lower noise through digital auto-zeroing techniques. The ICL7129ACPL+ represents the lead-free, RoHS-compliant version of this legacy component.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7129CPL from Microchip Technology is listed as a similar replacement option.