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Product details

Parameters

Number of input channels 1 Resolution (Bits) 22 Number of LEDs 2 Features Optical biosensing Operating temperature range (C) -40 to 85 Interface type Serial 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)
    • 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
    • LED Current:
      • Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
        Each with 8-Bit Current Resolution
    • Low Power:
      • 100 µA + Average LED Current
    • LED On-Time Programmability from
      (50 µs + Settle Time) to 4 ms
    • Independent LED2, LED1 Current Reference
  • Receive Channel with High Dynamic Range:
    • Input-Referred Noise:
      50 pARMS (at 5-µA PD Current)
    • 13.5 Noise-Free Bits (at 5-µA PD Current)
    • Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current
    • Low Power: < 2.3 mW at 3.0-V Supply
    • Rx Sample Time: 50 µs to 4 ms
    • I-V Amplifier with Seven Separate LED2 and LED1 Programmable Feedback R and C Settings
    • Integrated Digital Ambient Estimation and Subtraction
  • Integrated Fault Diagnostics:
    • Photodiode and LED Open and
      Short Detection
    • Cable On or Off Detection
  • Supplies:
    • Rx = 2.0 V to 3.6 V
    • Tx = 3.0 V or 5.25 V
  • Package: Compact VQFN-40 (6 mm × 6 mm)
  • Specified Temperature Range: –40°C to 85°C
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Description

The AFE4490 is a fully-integrated analog front-end (AFE) that is ideally suited for pulse-oximeter applications. The device consists of a low-noise receiver channel with a 22-bit 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 device, 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 –40°C to 85°C.

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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 AFE4490 Integrated Analog Front-End for Pulse Oximeters datasheet (Rev. H) Oct. 29, 2014
Technical articles Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
Technical articles Untethered: A new idea to measure vital signs in preemies Jun. 09, 2015
User guides AFE44x0SPO2EVM User's Guide (Rev. C) May 27, 2014
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

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
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
GUIS FOR EVALUATION MODULES (EVM) Download
SLAC556D.ZIP (188007 KB)

Software development

FIRMWARE Download
SLAC679A.ZIP (5349 KB)

Design tools & simulation

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

Reference designs

REFERENCE DESIGNS Download
Pulse Oximeter via Finger Clip Reference Design with BLE Connectivity
TIDA-00010 This reference design is for a complete SPO2 Pulse Oximeter finger clip end equipment featuring TI signal chain, power, and connectivity components. With TI's AFE4490 Pulse Ox AFE, you can accelerate and simplify your pulse ox design while still ensuring the highest of quality clinical measurements (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHA) 40 View options

Ordering & quality

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