The ICL7139CPL is a monolithic analog-to-digital converter (ADC) with a liquid crystal display (LCD) driver manufactured by Intersil Corporation (now Renesas). It is designed for use in digital panel meters and other display applications requiring a 3½ digit readout.

Applications:

• Digital panel meters
• Digital multimeters
• Temperature indicators
• Weight scales
• Process monitors

Features:

• 3½ digit LCD display driver
• Low power consumption
• On-chip clock oscillator
• Direct LCD drive capability
• Overrange indication
• Low input bias current

Benefits:

• Provides a complete solution for digital display applications.
• Reduces power consumption in battery-powered devices.
• Simplifies circuit design with integrated functions.
• Eliminates the need for external display drivers.
• Indicates when the input signal is beyond the measurement range.
• Accurate measurement of low-level signals.

Technical Specifications:

The ICL7139CPL typically operates from a single 5V power supply. It provides a 3½ digit display with a maximum count of ±1999. The input impedance is high, and the input bias current is low, minimizing the loading effect on the input signal. The internal oscillator requires a few external components to set the clock frequency. The ADC uses a dual-slope integration technique for accurate and stable measurements. The display outputs are multiplexed to drive the LCD segments directly. Refer to the datasheet for detailed electrical characteristics, timing diagrams, and application circuits.