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Product details

Parameters

Type Integrated Photoplethysmography (PPG) Number of input channels 2 Resolution (Bits) 24 Number of LEDs 3 Operating temperature range (C) -20 to 70 Interface type I2C, SPI open-in-new Find other Biosensing AFEs

Features

  • Transmitter:
    • Supports Common Anode LED Configuration
    • Dynamic Range: 100 dB
    • 8-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:
    • Supports 2 Time-Multiplexed Photodiode Inputs
    • 24-Bit Representation of the Current Input from the Photodiode in Twos Complement Format
    • Individual DC Offset Subtraction DAC
      (±15.75-µA Range) at TIA Input for Each LED, Ambient
    • Digital Ambient Subtraction at ADC Output
    • Transimpedance Gain: 10 kΩ to 2 MΩ
    • Dynamic Range: 100 dB
    • Dynamic Power-Saving Mode to Reduce Receiver Current to 200 µA
  • Pulse Frequency: 5 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
  • FIFO with 240 Sample Depth:
    • Programmable Partitioning Across Phases
  • I2C, SPI Interfaces: Selectable by Pin
  • Operating Temperature Range: –20°C to +70°C
  • 2.6-mm × 2.1-mm DSBGA, 0.4-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 AFE4405 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 up to two photodiodes. 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 stored in a 240-sample first in, first out (FIFO) block with programmable depth. The FIFO depth can be partitioned to accommodate the phases that must be stored. The FIFO can be read out using either an I2C or a SPI interface. The AFE also has a fully-integrated LED driver with an 8-bit current control. The device has a high dynamic range transmit-and-receive circuitry that helps with the sensing of very small signal levels.

To request a full data sheet or other design resources: request AFE4405


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More Information

Full data sheet and other design resources are available. Request now

Technical documentation

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Type Title Date
* Data sheet AFE4405 Ultra-Small, Integrated AFE with FIFO for Wearable, Optical Heart-Rate Monitoring and Bio-Sensing datasheet (Rev. C) Jul. 31, 2019
User guide AFE4405EVM Introduction User's Guide Apr. 13, 2016
Technical article Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
Technical article A new way to illuminate the human condition Dec. 30, 2013
Technical article Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Technical article 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 BOARD Download
document-generic User guide
199
Description

The AFE4403EVM is intended for evaluating the AFE4403 device. The fully integrated AFE is ideally suited for Pulse Oximeter and Heart rate monitoring applications and consists of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The AFE4403 has a (...)

Features
  • DB9 pulse oximeter sensor cable support
  • Acquire data at up to 3000 Hz in evaluation mode
  • USB based power and PC application connectivity
  • Access to all AFE4403 registers via an easy-to-use GUI
  • USB-based firmware upgrade option
EVALUATION BOARD Download
document-generic User guide
199
Description

The AFE4405 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 (...)

Features
  • Acquire data at up to 1000 SPS in evaluation mode
  • USB based power and PC application connectivity
  • Access to all AFE4405 registers via an easy-to-use GUI
  • USB-based firmware upgrade option
EVALUATION BOARD Download
document-generic User guide
149
Description

The AFE44x0SPO2EVM is intended for evaluating AFE4400 and AFE4490 devices. The family of devices are fully integrated AFE ideally suited for Pulse Oximeter applications and consist of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The (...)

Features
  • DB9 pulse oximeter sensor cable support
  • Acquire data at up to 3000 Hz in evaluation mode
  • USB based power and PC application connectivity
  • Access to all AFE44x0 registers via an easy to use GUI

Design tools & simulation

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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

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Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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Support & training

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