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Home » NEWEST Products » New by Manufacturer » Texas Instruments » AFE4490 Integrated Analog Front End - TI
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Texas Instruments AFE4490 Integrated Analog Front End
Texas Instruments AFE4490 Integrated Analog Front End

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TI AFE4490 Integrated Analog Front End

Texas Instruments AFE4490 Integrated Analog Front End is a fully-integrated AFE that is ideally suited for pulse-oximeter applications. This TI 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. AFE4490 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 AFE4490, 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.

  • Fully-Integrated Analog Front-End for Pulse Oximeter Applications
    • Flexible Pulse Sequencing and Timing Control
  • Transmit
    • Integrated LED Driver (H-Bridge or Push/Pull)
    • 110dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
    • LED Current: Programmable Ranges of 50mA, 75mA, 100mA, 150mA, and 200mA, Each with 8-Bit Current Resolution
    • Low Power: 100µA + Average LED Current
    • LED On-Time Programmability from (50µs + Settle Time) to 4ms
    • Independent LED2 and LED1 Current Reference
  • Receive Channel with High Dynamic Range
    • Input-Referred Noise
    • 50pARMS (at 5µA PD Current)
    • 13.5 Noise-Free Bits (at 5µA PD Current)
    • Analog Ambient Cancellation Scheme with Selectable 1µA to 10µA Ambient Current
    • Low Power: <2.3mA at 3.0V Supply
  • Integrated Fault Diagnostics
    • Photodiode and LED Open and Short Detection
    • Cable On/Off Detection
  • Medical Pulse Oximeter Applications
  • Industrial Photometry Applications

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