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Product details

Parameters

Type Integrated Photoplethysmography (PPG) Number of input channels 1 Resolution (Bits) 22 Number of LEDs 2 Operating temperature range (C) 0 to 70 Interface type SPI open-in-new Find other Biosensing AFEs

Package | Pins | Size

VQFN (RHA) 40 36 mm² 6 x 6 open-in-new Find other Biosensing AFEs

Features

  • Fully-Integrated Analog Front-End for Pulse Oximeter Applications:
    • Flexible Pulse Sequencing and
      Timing Control
  • Transmit:
    • Integrated LED Driver
      (H-Bridge, Push, or Pull)
    • Dynamic Range: 95 dB
    • LED Current:
      • Programmable to 50 mA with 8-Bit Current Resolution
    • Low Power:
      • 100 µA + Average LED Current
    • Programmable LED On-Time
    • Independent LED2 and LED1 Current Reference
  • Receive Channel with High Dynamic Range:
    • 13 Noise-Free Bits
    • Low Power: < 670 µA at 3.3-V Supply
    • Integrated Digital Ambient Estimation and Subtraction
    • Flexible Receive Sample Time
    • Flexible Transimpedance Amplifier with Programmable LED Settings
  • Integrated Fault Diagnostics:
    • Photodiode and LED Open and
      Short Detection
    • Cable On and Off Detection
  • Supplies:
    • Rx = 2.0 V to 3.6 V
    • Tx = 3.0 V to 5.25 V
  • Package: Compact VQFN-40 (6 mm × 6 mm)
  • Specified Temperature Range: 0°C to 70°C
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Description

The AFE4400 is a fully-integrated analog front-end (AFE) ideally suited for pulse oximeter applications. The device consists of a low-noise receiver channel with an integrated analog-to-digital converter (ADC), an LED transmit section, and diagnostics for sensor and LED fault detection. The device is a very configurable timing controller. This flexibility enables the user to have complete control of the device timing characteristics. To ease clocking requirements and provide a low-jitter clock to the AFE4400, an oscillator is also integrated that functions from an external crystal. The device communicates to an external microcontroller or host processor using an SPI™ interface.

The device is a complete AFE solution packaged in a single, compact VQFN-40 package (6 mm × 6 mm) and is specified over the operating temperature range of 0°C to 70°C.

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Technical documentation

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Type Title Date
* Datasheet AFE4400 Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters datasheet (Rev. H) Jul. 24, 2014
White paper Fortschrittliche Halbleitertechnologie für moderne Telemedizin-Anwendungen Oct. 28, 2020
White paper 持續進化的現代遠距照護應用半導 體技術 Oct. 28, 2020
White paper Evolving Semiconductor Technologies for Modern Telehealth Applications Oct. 26, 2020
Technical article Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
Technical article Consumer electronics benefit from analog technology Jan. 21, 2015
User guide AFE44x0SPO2EVM User's Guide (Rev. C) May 27, 2014
Technical article Life-saving technologies to the rescue Mar. 06, 2014
Technical article A new way to illuminate the human condition Dec. 30, 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
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 3000Hz in evaluation mode
  • USB based power and PC application connectivity
  • Access to all AFE44x0 registers via an easy to use GUI
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

Software development

FIRMWARE Download
SLAC678A.ZIP (5101 KB)
GUI FOR EVALUATION MODULE (EVM) Download
SLAC556E.ZIP (253328 KB)

Design tools & simulation

SIMULATION MODEL Download
SBAM167.ZIP (17 KB) - IBIS Model
SIMULATION TOOL 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
  • (...)

Reference designs

REFERENCE DESIGNS Download
Optical Heart Rate Monitor Reference Design with BLE Connectivity
TIDA-00011 This reference design is for a complete Optical Heart Rate Monitor wrist watch (no chest strap!) end equipment featuring TI signal chain, power, and connectivity components. With TI's AFE4400 AFE, you can accelerate and simplify your wrist based HRM design while still ensuring measurement (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHA) 40 View options

Ordering & quality

Information included:
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  • 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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