ICL7135CPI+2

ADCs/DACs - Special Purpose Overview

The ICL7135CPI+2 is a monolithic 4½-digit analog-to-digital converter manufactured by Analog Devices/Maxim Integrated. It utilizes dual-slope integration to achieve ±1 count accuracy over a 20,000-count resolution with a 2.0000V full-scale capability. The device features high-impedance differential inputs, true ratiometric operation, and automatic zeroing with less than 10µV offset. It provides multiplexed BCD outputs and digit drivers for direct display interfacing. Key electrical parameters include a maximum input bias current of 10pA, zero drift of 0.5µV/°C, and power dissipation of 800mW in the plastic package. It operates within a temperature range of 0°C to +70°C.

ADCs/DACs - Special Purpose Feature Summary

• Dual-slope conversion architecture with guaranteed ±1 count accuracy
• Multiplexed BCD outputs with STROBE, BUSY, OVERRANGE, and UNDERRANGE status lines
• High impedance differential inputs with 10pA max input bias current
• Auto-zero and auto-polarity functions ensuring precise null detection

ADCs/DACs - Special Purpose Applications

• Microprocessor-based data acquisition systems
• Digital Volt Meters (DVM) and Digital Panel Meters (DPM)
• Precision measurement instruments requiring ratiometric operation

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix '+2' against official documentation to confirm it denotes a second-source or upgraded quality level variant without functional changes. Confirm availability status as supply may be restricted. Ensure the PDIP-28 through-hole package matches the target PCB footprint requirements.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a high-precision, low-noise ADC with direct display interface capabilities is required. The ICL7135CPI+2 is suitable for applications needing TTL-compatible digital outputs and easy UART/microprocessor interfacing. Consider the 800mW power dissipation limit and ensure adequate thermal management for the plastic DIP package.

ADCs/DACs - Special Purpose Part Context

The ICL7135 series represents a family of high-precision integrating A/D converters. The 'CPI' designation indicates a Plastic Dual In-line Package with lead composition conforming to specific environmental standards. The '+2' suffix typically identifies an improved second-source version offering tighter test specifications and enhanced reliability metrics compared to standard variants.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements include other ICL7135 variants such as ICL7135CJI (CERDIP) or ICL7135CAI+T (SSOP), provided the package type is adapted. Verify that any substitute maintains the same 28-pin configuration and electrical characteristics for seamless integration.