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AFE4404 - Ultra-Small Integrated AFE

General 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.

Key Features

  • 1 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 Am.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Product Folder Sample & Buy Technical Documents Tools & Software Support & Community AFE4404 SBAS689D – JUNE 2015 – REVISED DECEMBER 2016 AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing 1 Features •1 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 Rang