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AFE4405 Key Features

  • 1 Transmitter
  • Supports mon 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 plement Format
  • Individual DC Offset Subtraction DAC (±15.75-µA Range) at TIA Input for Each LED, Ambient

Related Texas Instruments Datasheets

Part Number Description
AFE4400 Integrated Analog Front-End
AFE4403 Ultra-Small Integrated Analog Front-End
AFE4404 Ultra-Small Integrated AFE
AFE4490 Integrated Analog Front-End
AFE4300 Integrated Analog Front-End

AFE4405 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).

AFE4405 Applications

  • Optical Heart-Rate Monitoring (HRM) for Wearables, Hearables