The Intersil ICL7109COL is a high-performance, 12-bit binary Analog-to-Digital Converter (ADC) designed for microprocessor-based data acquisition systems. It is a monolithic integrating converter offering excellent linearity, low noise, and high accuracy. This ADC is designed to interface directly with 8-bit microprocessors, simplifying system design and reducing component count.

Applications

• Digital panel meters
• Data acquisition systems
• Process control
• Instrumentation
• Remote data logging

Features

• 12-bit binary output with sign bit
• Direct microprocessor interface
• On-chip clock oscillator
• Low input bias current
• Single +5V power supply operation
• Overrange indication
• Zero adjust and full-scale adjust capabilities

Benefits

• High accuracy and resolution for precise measurements
• Simplified system design due to direct microprocessor interface
• Reduced component count, lowering system cost
• Easy calibration using on-chip adjustment features
• Reliable performance in a variety of applications

Additional Details

The ICL7109COL utilizes a dual-slope integration technique to achieve high accuracy and noise rejection. The conversion process involves integrating the input signal for a fixed period, followed by integrating a reference voltage until the integrator output returns to zero. The time required for the reference integration is proportional to the input voltage. The converter includes an on-chip clock oscillator, but an external clock can also be used for improved stability. The output data is available in a parallel format, making it easy to interface with a microprocessor. The device requires a single +5V power supply for operation. It is available in a 40-pin DIP package. The integration time is typically around 400ms which gives excellent 50/60Hz noise rejection. The ICL7109COL is a reliable and cost-effective solution for a wide range of data acquisition applications. Key specifications include a linearity of ±1/2 LSB and a typical input bias current of 10pA. The operating temperature range is typically 0°C to +70°C.