ICL7129RCPL

ADCs/DACs - Special Purpose Overview

The Harris Corporation ICL7129RCPL is a 4-1/2 digit single-chip analog-to-digital converter (ADC) designed to directly drive multiplexed liquid crystal displays. It utilizes a dual-slope integration technique with digital auto-zeroing to achieve high precision without external compensation capacitors. The device operates on a single power supply within the 6V to 14V range and consumes approximately 1mA of current. It features a true differential input, low battery detection, and overrange/underrange outputs, making it suitable for high-resolution measurement applications such as digital multimeters.

ADCs/DACs - Special Purpose Feature Summary

• 4-1/2 Digit Resolution: Provides ±19,999 count resolution with 10µV accuracy on the 200mV scale.
• Direct LCD Drive: Integrates a display driver capable of controlling 4-digit multiplexed LCDs with decimal points and annunciators.
• Digital Auto-Zero: Eliminates offset errors through internal digital subtraction, removing the need for external auto-zero capacitors.
• Low Power Consumption: Operates efficiently with a typical supply current of 1mA, supporting battery-powered designs.

ADCs/DACs - Special Purpose Applications

• Handheld Digital Multimeters
• Precision Digital Panel Meters
• Industrial Process Control Instruments

ADCs/DACs - Special Purpose Part Context

The ICL7129 series belongs to a family of high-performance ADCs originally developed by Intersil and later acquired by Maxim Integrated (now Analog Devices). The 'R' suffix in ICL7129RCPL typically denotes a specific temperature grade or packaging variant within the commercial or industrial range, while 'CPL' indicates a 40-pin Plastic Dual In-line Package (PDIP) in a tube. This component represents a mature technology standard for cost-effective, high-accuracy DC voltage measurement systems.