AFE4490RHAR

Analog Front End (AFE) Overview

The AFE4490RHAR is a fully integrated analog front-end (AFE) designed for pulse oximeter applications, manufactured by Texas Instruments. It features a low-noise receiver channel with a 22-bit ADC, an LED transmission unit, and diagnostic functions for sensor and LED fault detection. The device includes a configurable timing controller and an oscillator powered by an external crystal to provide a low-jitter clock. Communication with external microcontrollers occurs via an SPI interface. It operates within a supply voltage range of 2 V to 3.6 V and is housed in a compact VQFN-40 package.

Analog Front End (AFE) Feature Summary

• Integrated 22-bit ADC with low-noise receiver channel
• Configurable timing controller with external crystal oscillator
• SPI interface for host communication
• VQFN-40 (6 mm x 6 mm) package

Analog Front End (AFE) Applications

• Pulse oximeters
• Medical monitoring devices

Analog Front End (AFE) Procurement Notes

Verify the suffix RHAR indicates the reel packaging format as specified in distributor listings. Confirm RoHS compliance status through official documentation. Check humidity sensitivity handling requirements during storage and assembly. Ensure the order quantity aligns with the standard reel size of 2500 units if applicable.

Analog Front End (AFE) Selection Notes

Select this component for designs requiring a complete AFE solution for pulse oximetry. It supports flexible pulse sequencing and timing control. The device integrates LED drivers and high dynamic range reception. Consider the 2 V to 3.6 V input voltage range and -40°C to +85°C operating temperature when designing the power and thermal management systems.

Analog Front End (AFE) Part Context

The AFE4490RHAR belongs to the AFE4490 series from Texas Instruments. It is part of a family of analog front-ends optimized for optical biosensing. The RHAR designation typically denotes the tape and reel packaging variant of the AFE4490 device, facilitating automated surface-mount assembly processes.

Analog Front End (AFE) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided data. Evaluate compatibility based on pinout, electrical specifications, and software register maps before considering alternative components.