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AFE4404

ACTIVE

Ultra-Small Integrated AFE for Wearable, Optical Heart-Rate Monitoring and Biosensing

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Data sheet

AFE4404

ACTIVE
Data sheet Order now

Product details

Applications Clinical fingertip pulse oximetry, Hearables, Optical-HRM Number of input channels 1 Resolution (Bits) 22 Number of LEDs 3 Interface type I2C Operating temperature range (°C) -20 to 70 Rating Catalog
Applications Clinical fingertip pulse oximetry, Hearables, Optical-HRM Number of input channels 1 Resolution (Bits) 22 Number of LEDs 3 Interface type I2C Operating temperature range (°C) -20 to 70 Rating Catalog
DSBGA (YZP) 15 4.8125 mm² 1.75 x 2.75
  • Transmitter:
    • Supports Common Anode LED Configuration
    • Dynamic Range: 100 dB
    • 6-Bit Programmable LED Current to 50 mA (Extendable to 100 mA)
    • Programmable LED On-Time
    • Simultaneous Support of 3 LEDs for Optimized SPO2, HRM, or Multi-Wavelength HRM
  • Receiver:
    • 24-Bit Representation of the Current Input from a Photodiode in Twos Complement Format
    • Individual DC Offset Subtraction DAC at TIA Input for Each LED and Ambient Phase
    • Digital Ambient Subtraction at ADC Output
    • Programmable Transimpedance Gain:
      10 kΩ to 2 MΩ
    • Dynamic Range: 100 dB
    • Average Current Less Than 200 µA for PPG Signal Acquisition
  • Pulse Frequency: 10 SPS to 1000 SPS
  • Flexible Pulse Sequencing and Timing Control
  • Flexible Clock Options:
    • External Clocking:
      4-MHz to 60-MHz Input Clock
    • Internal Clocking: 4-MHz Oscillator
  • I2C Interface
  • Operating Temperature Range: –20°C to 70°C
  • 2.6-mm × 1.6-mm DSBGA Package, 0.5-mm Pitch
  • Supplies: Rx: 2 V to 3.6 V, Tx: 3 V to 5.25 V,
    IO: 1.8 V to 3.6 V
  • Transmitter:
    • Supports Common Anode LED Configuration
    • Dynamic Range: 100 dB
    • 6-Bit Programmable LED Current to 50 mA (Extendable to 100 mA)
    • Programmable LED On-Time
    • Simultaneous Support of 3 LEDs for Optimized SPO2, HRM, or Multi-Wavelength HRM
  • Receiver:
    • 24-Bit Representation of the Current Input from a Photodiode in Twos Complement Format
    • Individual DC Offset Subtraction DAC at TIA Input for Each LED and Ambient Phase
    • Digital Ambient Subtraction at ADC Output
    • Programmable Transimpedance Gain:
      10 kΩ to 2 MΩ
    • Dynamic Range: 100 dB
    • Average Current Less Than 200 µA for PPG Signal Acquisition
  • Pulse Frequency: 10 SPS to 1000 SPS
  • Flexible Pulse Sequencing and Timing Control
  • Flexible Clock Options:
    • External Clocking:
      4-MHz to 60-MHz Input Clock
    • Internal Clocking: 4-MHz Oscillator
  • I2C Interface
  • Operating Temperature Range: –20°C to 70°C
  • 2.6-mm × 1.6-mm DSBGA Package, 0.5-mm Pitch
  • Supplies: Rx: 2 V to 3.6 V, Tx: 3 V to 5.25 V,
    IO: 1.8 V to 3.6 V

The AFE4404 is an analog front-end (AFE) for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be read out using an I2C interface. The AFE also has a fully-integrated LED driver with a 6-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal levels.

The AFE4404 is an analog front-end (AFE) for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be read out using an I2C interface. The AFE also has a fully-integrated LED driver with a 6-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal levels.
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Technical documentation

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Type Title Date
* Data sheet AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing datasheet (Rev. D) PDF | HTML 01 Dec 2016
User guide AFE4404 Development Guide (Rev. A) 17 Dec 2015
Technical article Offset correction improves the next generation of heart-rate smart watches PDF | HTML 24 Aug 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

AFE4404EVM — AFE4404 Ultra-Small Integrated AFE for Wearable Optical Heart-Rate Monitoring Evaluation Module

The AFE4404EVM is intended for evaluating TI's AFE4404 device. The fully integrated AFE is ideally suited for pulse oximeter and heart rate monitoring applications.  It consists of a low noise receive channel and LED transmit section. The AFE4404 has a very highly configurable timing (...)

User guide: PDF
Not available on TI.com
Code example or demo

SBAC134 — I2C Interface Sample Code for AFE4404 in ST MCU Platform

Supported products & hardware

Supported products & hardware

Products
Biosensing AFEs
AFE4404 — Ultra-Small Integrated AFE for Wearable, Optical Heart-Rate Monitoring and Biosensing
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Driver or library

AFE4404SW-LINUX — AFE4404 Linux Driver

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Firmware

SLAC718 — AFE4404EVM Firmware Source v1.5

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Supported products & hardware

Supported products & hardware

Products
Biosensing AFEs
AFE4404 — Ultra-Small Integrated AFE for Wearable, Optical Heart-Rate Monitoring and Biosensing
Hardware development
Evaluation board
AFE4404EVM — AFE4404 Ultra-Small Integrated AFE for Wearable Optical Heart-Rate Monitoring Evaluation Module
lock Download
GUI for evaluation module (EVM)

SLAC704 — AFE4404EVM GUI v1.2.2

lock = Requires export approval (1 minute)
Supported products & hardware

Supported products & hardware

Products
Biosensing AFEs
AFE4404 — Ultra-Small Integrated AFE for Wearable, Optical Heart-Rate Monitoring and Biosensing
Hardware development
Evaluation board
AFE4404EVM — AFE4404 Ultra-Small Integrated AFE for Wearable Optical Heart-Rate Monitoring Evaluation Module
lock Download
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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DSBGA (YZP) 15 View options
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