AK9723AD

Overview

The AK9723AD is an IR LED driver and Analog Front End (AFE) IC designed for NDIR gas sensing applications. It integrates a dual-channel AFE, sigma-delta ADC, and programmable constant current LED driver to process IR photo detector signals simultaneously. The device communicates with a host MCU via an I2C bus supporting standard (100kHz) and fast mode (400kHz). It operates on a power supply voltage range of 2.7V to 3.6V and features a small 16-pin QFN package measuring 4.0mm x 4.0mm x 0.7mm.

Feature Summary

• Integrated LED Driver with Programmable Constant Current Circuit
• Dual Channel Input AFE
• Interrupt Function

Applications

• CO2 Sensor for HVAC System
• CO2 refrigerant leakage detection

Procurement Notes

Verify the specific manufacturer part number against official documentation before procurement. Confirm that the component meets all required electrical specifications and environmental operating conditions for the intended application. Ensure compatibility with the host system's communication protocols and power supply constraints.

Selection Notes

Select this component for NDIR gas sensing systems requiring integrated LED driving and signal processing. Ensure the host MCU supports I2C communication at the required clock speeds. Verify that the power supply voltage falls within the specified 2.7V to 3.6V range and that the physical footprint accommodates the 16-pin QFN package dimensions.

Part Context

The AK9723AD belongs to Asahi Kasei Microdevices' portfolio of sensor interface solutions. It is specifically engineered for non-dispersive infrared (NDIR) gas sensing applications, combining analog front-end capabilities with digital control interfaces to simplify system design for automotive and industrial environments.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.