ICL7135

The ICL7135 is a precision 4½ digit analog-to-digital (A/D) converter designed for high-accuracy measurement applications. It integrates an auto-zero, dual-slope conversion technique to provide accurate and stable readings, ideal for digital voltmeters and other measurement instruments.

Key Features:

• High Accuracy: Provides 4½ digit resolution (±20,000 counts) for precise measurements.
• Auto-Zeroing: Built-in auto-zeroing for reduced offset errors and enhanced accuracy.
• Dual-Slope Conversion: Utilizes dual-slope integration for noise rejection and stable readings.
• Low Power Consumption: Suitable for battery-operated devices.
• Differential Input: Allows for true differential measurements.
• Digital and Analog Sections: Separate power supplies for digital and analog sections to reduce noise.
• Display Interface: Designed to drive 7-segment LED displays directly.
• Package Type: Available in DIP-28 and other packages.

Technical Specifications:

• Resolution: 4½ digits (±20,000 counts)
• Operating Voltage: Typically ±5V for analog section, +5V for digital section
• Input Voltage Range: ±2V (differential input)
• Conversion Rate: Up to 3 readings per second
• Input Impedance: Very high input impedance, typically >100 MΩ
• Operating Temperature Range: 0°C to +70°C

Applications:

• Digital Voltmeters: Ideal for high-precision digital voltmeter designs.
• Measurement Instruments: Used in various precision measurement and test instruments.
• Data Acquisition Systems: Suitable for high-accuracy data acquisition applications.
• Battery-Powered Devices: Efficient power usage makes it suitable for portable instruments.
• Calibration Equipment: Applied in equipment requiring accurate calibration and measurement.

Datasheet:
For detailed technical information, refer to the ICL7135 datasheet.