ICL7135CN

ADCs/DACs - Special Purpose Overview

The ICL7135CN is a 4.5-digit dual-slope analog-to-digital converter (ADC) manufactured by Texas Instruments. It features a 28-pin DIP package and operates with a supply voltage range of 4V to 6V. The device provides a sampling rate of 3 ksps and utilizes a BCD output interface. Designed for surface or through-hole mounting, it functions within an operating temperature range of 0°C to 70°C. The ADC consumes 1 mA of current and dissipates approximately 5 mW of power. Its architecture ensures high resolution equivalent to 14-bit binary numbers with a conversion error of ±1 LSB.

ADCs/DACs - Special Purpose Feature Summary

• Dual-slope integration architecture providing high noise immunity
• 4.5-digit resolution with 0-19999 digital output range
• BCD output interface compatible with standard displays
• Low power consumption of 1 mA at 5V supply

ADCs/DACs - Special Purpose Applications

• High-precision digital voltmeters
• Temperature transmitters using microcontroller interfaces
• Low resistance measurement instruments
• Electronic scales and weighing systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type matches the application requirements, as the ICL7135CN specifically denotes the DIP-28 through-hole variant. Confirm the suffix indicates the commercial temperature grade (0°C to 70°C). Ensure the source document explicitly identifies Texas Instruments as the manufacturer for this specific part number to avoid confusion with legacy Maxim Integrated branding.

ADCs/DACs - Special Purpose Selection Notes

Select the ICL7135CN when a through-hole 28-pin DIP package is required for prototyping or specific board layouts. Choose this component over surface-mount variants like the TLC7135CDW if manual assembly or rework capabilities are necessary. Ensure the design accommodates the external RC timing components required for the dual-slope conversion cycle.

ADCs/DACs - Special Purpose Part Context

The ICL7135CN belongs to the TLC7135 family of precision ADCs. While originally developed by Intersil and later Maxim Integrated, Texas Instruments now produces this component. The 'CN' suffix typically specifies the plastic DIP package and commercial temperature range, distinguishing it from ceramic packages or industrial temperature variants.

ADCs/DACs - Special Purpose Replacement Considerations

The TLC7135CDW serves as a pin-compatible surface-mount replacement in the SOIC-28 package. Other dual-slope ADCs may require significant circuit redesign due to different pinouts or timing requirements.