ICL7107CQH+D

ADCs/DACs - Special Purpose Overview

The ICL7107CQH+D is a monolithic 3½-digit analog-to-digital converter (ADC) designed for direct LED display drive. It integrates polarity and digit drivers, segment decoders, a voltage reference, and a clock circuit. Utilizing dual-slope conversion with a zero-integrator phase, it eliminates overrange hangover and hysteresis. The device features true differential inputs and references, ensuring high accuracy with rollover error less than one count and zero reading drift under 1µV/°C. Operating on a single +5V supply, it consumes typically 1.8mA. Packaged in a 44-pin PLCC, it supports industrial environments through automatic interference rejection.

ADCs/DACs - Special Purpose Feature Summary

• Directly drives common anode LED displays without external driver circuitry
• True differential input and reference for ratiometric measurements
• Integrated clock and voltage reference reducing external component count
• Low noise performance (<15µVP-P) with guaranteed first reading recovery from overrange

ADCs/DACs - Special Purpose Applications

• Digital panel meters
• Precision null detection
• Bridge transducer measurements
• Ratiometric resistance sensing

ADCs/DACs - Special Purpose Procurement Notes

Verify the 'Maxim Advantage' status, which indicates upgraded quality levels and tighter test specifications compared to standard sources. Confirm RoHS compliance via the '+' suffix. Check current availability as this component may be subject to Last Time Buy notices or limited stock depending on the distributor channel.

ADCs/DACs - Special Purpose Selection Notes

Select the ICL7107 variant specifically for common anode LED displays; use ICL7106 for LCD applications. Ensure the power supply range matches the +5V requirement for the C-series. Verify that the 44-pin PLCC package fits the PCB land pattern, noting the specific footprint requirements for surface mount assembly.

ADCs/DACs - Special Purpose Part Context

This part belongs to the ICL7106/ICL7107 family of 3½-digit ADCs originally developed by Intersil and later acquired by Maxim Integrated, now part of Analog Devices. The series is known for high integration and low cost in digital measurement systems. The CQH+D designation specifies the commercial temperature range, PLCC package, and lead-free/RoHS-compliant construction.

ADCs/DACs - Special Purpose Replacement Considerations

The ICL7106CQH+D serves as the LCD-compatible counterpart within the same package. Other manufacturers may offer pin-compatible dual-slope ADCs, but functional equivalence requires verifying the integrated reference and clock capabilities to maintain the simplified peripheral design.