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Product details

Parameters

Number of input channels 1 Resolution (Bits) 24 Number of LEDs 3 Features Optical biosensing Operating temperature range (C) -20 to 70 Interface type I2C open-in-new Find other Biosensing AFEs

Package | Pins | Size

DSBGA (YZP) 15 0 mm² 2.49 x 1.49 open-in-new Find other Biosensing AFEs

Features

  • 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
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Description

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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing datasheet (Rev. D) Dec. 01, 2016
User guides AFE4404 Development Guide (Rev. A) Dec. 17, 2015
Technical articles Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
Technical articles A new way to illuminate the human condition Dec. 30, 2013
Technical articles Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Technical articles Virtual hospital implementation using a worn health monitor Nov. 13, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
199
Description

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 controller (...)

Features
  • DB9 pulse oximeter sensor cable support
  • Acquire data at up to 1000 Hz in evaluation mode
  • USB based power and PC application connectivity
  • Access to all AFE4404 registers via an easy-to-use GUI
  • USB-based firmware upgrade option
GUIS FOR EVALUATION MODULES (EVM) Download
SLAC704B.ZIP (334014 KB)

Software development

CODE EXAMPLES & DEMOS Download
SBAC134.ZIP (16 KB)
DRIVERS & LIBRARIES Download
AFE4404 Linux Driver
AFE4404SW-LINUX
FIRMWARE Download
SLAC718A.ZIP (5732 KB)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YZP) 15 View options

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