AFE4950YBGR

Analog Front End (AFE) Overview

The AFE4950YBGR is an ultra-small, integrated analog front-end (AFE) designed for wearable optical heart-rate monitoring, SpO2, and electrical bio-sensing. It supports simultaneous and synchronized acquisition of up to 24 PPG channels and a single-lead ECG signal. The device features flexible allocation of eight LEDs and four photodiodes per phase. Key specifications include a system SNR up to 109 dB at 16 µA PD current, low power consumption with typical values of 15 µA for an LED and 20 µA for the receiver, and a 256-sample FIFO. It operates on supplies of 1.7–3.6 V for Rx, 3–5.5 V for Tx, and 1.7–Rx_SUP for IO, housed in a 2.6-mm × 2.5-mm DSBGA package.

Analog Front End (AFE) Feature Summary

• Simultaneous synchronized acquisition of up to 24 PPG and single-lead ECG signals
• ECG signal chain with 0.7 µV-rms input noise and programmable INA gain of 11 or 21
• PPG transmitter supporting 8-bit programmable LED current from 25 mA to 250 mA
• PPG receiver with automatic ambient cancellation and near 100 dB rejection up to 10 Hz

Analog Front End (AFE) Applications

• Optical Heart-Rate Monitoring (HRM) for Wearables and Hearables
• High performance ECG signal acquisition
• Synchronized PPG and ECG for Blood Pressure estimation
• Heart-rate variability (HRV) analysis
• Pulse oximetry (SpO2) measurements

Analog Front End (AFE) Procurement Notes

Verify the ordering suffix 'YBGR' corresponds to the DSBGA-36 package with a 3000-unit tape and reel quantity. Confirm RoHS compliance and lead finish details (SNAGCU) via the manufacturer's orderable addendum. Ensure design compatibility with the specified supply voltage ranges and interface protocols before procurement.

Analog Front End (AFE) Selection Notes

Select this component for applications requiring compact form factors due to its 2.6-mm × 2.5-mm DSBGA footprint. Choose based on the need for synchronized multi-wavelength PPG and single-lead ECG processing. Consider the low power consumption profiles for battery-operated wearables and verify that the SPI/I2C interface options meet system connectivity requirements.

Analog Front End (AFE) Part Context

The AFE4950 series is part of Texas Instruments' portfolio of biosensing analog front-ends tailored for wearable devices. It integrates both optical and electrical sensing capabilities into a single chip, reducing board space and complexity compared to discrete solutions. The YBGR suffix specifically denotes the production version in the DSBGA package with large tape-and-reel packaging.

Analog Front End (AFE) Replacement Considerations

Check the TI product folder for alternative packages like AFE4950YBGT (smaller reel). No direct cross-model substitutes are listed; evaluate family members such as AFE44xx series only if specific feature sets differ significantly.