AFE4432YCHT

Analog Front End (AFE) Overview

The AFE4432YCHT is an integrated analog front-end (AFE) designed for optical bio-sensing applications, including heart-rate monitoring (HRM) and pulse oximetry (SpO2). It supports up to four LEDs and three photodiodes with flexible phase allocation. The device features a receiver current consumption of 12 µA and achieves a peak system signal-to-noise ratio of 115 dB in the 0.5–10 Hz band. Electrical specifications include an LED current range of 25 mA to 250 mA, transimpedance gain from 3.7 kΩ to 1 MΩ, and supplies of 1.7–1.9 V for Rx and 3–5.5 V for Tx. It utilizes a 160-sample FIFO and communicates via SPI or I2C interfaces within a 1.9 mm × 1.8 mm DSBGA package.

Analog Front End (AFE) Feature Summary

• Supports up to 12 phase sets with simultaneous signal acquisition at different data rates
• Transmitter includes 8-bit programmable LED current control (25 mA to 250 mA)
• Receiver features two parallel TIA/filter sets with ambient and LED offset subtraction DACs
• Low power consumption with typical receiver current of 12 µA for continuous HRM

Analog Front End (AFE) Applications

• Optical Heart-Rate Monitoring (HRM) for wearables and hearables
• Heart-Rate Variability (HRV) analysis
• Pulse Oximetry (SpO2) measurements

Analog Front End (AFE) Procurement Notes

Verify the orderable part number AFE4432YCHT against the manufacturer's latest documentation to confirm active status and packaging details. The datasheet indicates this specific suffix corresponds to a tape and reel quantity of 250 units in a DSBGA-25 package. Confirm environmental compliance and moisture sensitivity levels prior to procurement.

Analog Front End (AFE) Selection Notes

Select the AFE4432YCHT when designing compact optical sensing systems requiring high dynamic range and low power consumption. Ensure the design accommodates separate supply rails for the transmitter (3–5.5 V) and receiver (1.7–1.9 V). Verify that the application requires support for up to four LEDs and three photodiodes with time-multiplexed inputs.

Analog Front End (AFE) Part Context

The AFE4432YCHT belongs to the AFE4432 family of ultra-small integrated analog front-ends manufactured by Texas Instruments. It is specifically engineered for optical bio-sensing, distinguishing itself through its ability to handle multiple LED and photodiode configurations within a minimal footprint suitable for wearable form factors.

Analog Front End (AFE) Replacement Considerations

Consult the TI product folder for alternative devices within the AFE4432 series or other compatible optical AFEs if pinout or performance requirements differ. No direct substitute part numbers are explicitly confirmed in the provided source material.