ICL7149CPL

ADCs/DACs - Special Purpose Overview

The ICL7149CPL is a 3.5-digit, autoranging analog-to-digital converter (ADC) integrated circuit manufactured by Harris Corporation. It functions as the core component of a complete digital voltmeter system, incorporating a high-impedance chopper-stabilized operational amplifier and a multiplexed seven-segment LED display driver. The device supports multiple measurement ranges including DC voltage, AC voltage, DC current, and resistance, utilizing an external clock oscillator and reference voltage to achieve precise data conversion without requiring complex external logic.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3.5-digit A/D converter with built-in chopper-stabilized op amp
• Multiplexed seven-segment LED display driver for direct readout
• Autoranging capability across multiple measurement functions
• Internal clock oscillator eliminates need for external timing components

ADCs/DACs - Special Purpose Applications

• Digital panel meters
• Portable multimeters
• Industrial process control instrumentation
• Battery testers

ADCs/DACs - Special Purpose Part Context

The ICL7149 belongs to the Intersil/Harris ICL7100 series of single-chip ADCs, which were industry standards for precision measurement during the 1980s and 1990s. The 'CPL' suffix typically denotes a plastic DIP package variant. This component represents a legacy technology solution for cost-effective digitization of analog signals in dedicated hardware instruments before the widespread adoption of microcontroller-based systems.