Overview

Features and Benefits

  • 2.8 mm × 5.0 mm module with integrated optical components
    • 660 nm LED, 880 nm IR LED, and photodiode
  • Fully integrated AFE, ADC, LED drivers, and timing core
  • Custom optical package for use under a glass window
  • Programmable 2-channel, 8.5 mA to 370 mA LED drivers
  • Provision to use external LED emitters
  • Low power
  • Specifically designed for ultralow direct optical reflections
  • Independent AFE settings per channel
  • I2C data and control interface
  • Burst accumulator enabling 20 bits per sample period
  • Sample to sample accumulator enabling up to 27 bits per data read
  • 16-bit or 32-bit register or FIFO readout per channel

Product Details

The ADPD144RI is a highly integrated, photometric front end optimized for photoplethysmography (PPG) detection of blood oxygenation (SpO2) by synchronous detection in red and infrared wavelengths. Synchronous measurement allows rejection of both dc and ac ambient light interference with extremely low power consumption.

The module combines highly efficient, light emitting diode (LED) emitters and a sensitive 4-channel, deep diffusion photodiode (PD1 to PD4) with a custom application specific integrated circuit (ASIC) in a compact package that provides optical isolation between the integrated LED emitters and the detection photodiodes to improve through tissue, signal-tonoise ratio (SNR).

The ASIC consists of a 4-channel analog front end (AFE) with two independently configurable datapaths with separate gain and filter settings, a 14-bit analog-to-digital converter (ADC) with a burst accumulator, two flexible, independently configurable, LED drivers, and a digital control block. The digital control block provides AFE and LED timing, signal processing, and communication. Data output and functional configuration occur over a 1.8 V I2C interface.

Applications

  • Optical heart rate monitoring
  • Reflective SpO2 measurement

For additional ADI Healthcare Products and related information, please visit www.analog.com/healthcare.

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.