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Best-in-Class Optical Pulse Oximeter and Heart-Rate Sensor AFE for Wearable Health

Best-in-Class SNR for Addressing Low Perfusion & New Use Cases

Product Details

The MAX86171 is an ultra-low-power optical data acquisition system with both transmit and receive channels. On the transmitter side, the MAX86171 has nine LED driver output pins, programmable from three high-current, 8-bit LED drivers. On the receiver side, MAX86171 has two low-noise charge integrating front-ends that each include independent 19.5 bit ADCs and best-in-class ambient light cancellation (ALC) circuits, producing the highest performing integrated optical data acquisition system on the market today.

Due to its low power consumption, compact size, ease and flexibility of use, the MAX86171 is ideal for a wide variety of optical sensing applications such as pulse oximetry and heart rate detection.

The MAX86171 operates on a 1.8V main supply voltage and a 3.1V to 5.5V LED driver supply voltage. The device supports both I2C and SPI compatible interfaces in a fully autonomous way. The device has a large 256-word built-in FIFO. The MAX86171 is available in a compact 28-bump WLP package.

Key Features

  • Complete Dual-Channel Optical Data Acquisition System
  • Ultra Low-Power Operation for Wearable Devices
    • Low-Power Operation, Optical Readout Channel < 11μA at 25fps
    • Exposure Integration Period Ranging from 14.6μs to 117.1μs
    • Low Shutdown Current < 1μA
  • Excellent Top-End Dynamic Range > 91dB in White Card Loop-Back Test (Nyquist Sample-to-Sample Variance)
  • Extended Dynamic Range up to 110dB (Averaging and Off-Chip Filtering)
  • Supports Frame Rates from 1fps to 2.9kfps
  • High Resolution 19.5-Bit Charge Integrating ADCs
  • Supports Four PD Inputs for Multi-Parameter Measurements
  • Supports Nine LED Driver Output Pins Generated from Three 8-Bit LED Current Drivers
  • Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance in 117.1μs Integration Time)
  • Excellent Ambient Range and Rejection Capability
    • > 100μA Ambient Photodetector Current
    • > 70dB Ambient Rejection at 120Hz (Average Mode > 2)
  • Miniature 2.78mm x 1.71mm, 7 x 4 0.35mm Ball Pitch WLP Package
  • -40°C to +85°C Operating Temperature Range

Applications/Uses

  • Wearable Devices for Fitness, Wellness, and Medical Applications
  • Clinical Accuracy
  • Suitable for Wrist, Finger, Ear, and Other Locations
  • Optimized Performance to Detect:
  • Optical Heart Rate
  • Heart Rate Variability
  • Oxygen Saturation (SpO2)
  • Body Hydration
  • Muscle and Tissue Oxygen Saturation (SmO2 and StO2)
  • Maximum Oxygen Consumption (VO2 max)
Parametric specs for Bio-Sensors
ISUPPLY (µA) (typ) 11
Shutdown Mode Supply Current (µA) (typ) 0.6
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 19
SNR (dB) 109
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/28
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Technical Docs

Design & Development

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Description

The MAX86171 evaluation system (EV sys) allows for the quick evaluation of the MAX86171 optical AFE for applications at various sites on the body, particularly the wrist. MAX86171 supports both I2C and SPI compatible interfaces. MAX86171 has two optical readout channels that operate simultaneously. The EV sys allows flexible configurations to optimize measurement signal quality at minimal power consumption. The EV sys helps the user quickly learn about how to configure and use the MAX86171.

The EV sys consists of two boards. MAXSensor BLE is the main data acquisition board while MAX86171_OSB# is the sensor daughter board for MAX86171. The EV sys can be powered using the USB-C supply or LiPo Battery.

The EV sys comes with a MAX86171ENI+ in a 28-bump WLP.

View Details

Features

  • Quick Evaluation of the MAX86171
  • Supports Optimization of Configurations
  • Facilitates Understanding MAX86171 Architecture and Solution Strategy
  • Real-time Monitoring
  • Data Logging Capabilities
  • On-Board Accelerometer
  • Bluetooth LE

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SIMULATION MODELS

MAX86171 IBIS Model

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Parameters

Parametric specs for Bio-Sensors
ISUPPLY (µA) (typ) 11
Shutdown Mode Supply Current (µA) (typ) 0.6
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 19
SNR (dB) 109
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/28

Key Features

  • Complete Dual-Channel Optical Data Acquisition System
  • Ultra Low-Power Operation for Wearable Devices
    • Low-Power Operation, Optical Readout Channel < 11μA at 25fps
    • Exposure Integration Period Ranging from 14.6μs to 117.1μs
    • Low Shutdown Current < 1μA
  • Excellent Top-End Dynamic Range > 91dB in White Card Loop-Back Test (Nyquist Sample-to-Sample Variance)
  • Extended Dynamic Range up to 110dB (Averaging and Off-Chip Filtering)
  • Supports Frame Rates from 1fps to 2.9kfps
  • High Resolution 19.5-Bit Charge Integrating ADCs
  • Supports Four PD Inputs for Multi-Parameter Measurements
  • Supports Nine LED Driver Output Pins Generated from Three 8-Bit LED Current Drivers
  • Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance in 117.1μs Integration Time)
  • Excellent Ambient Range and Rejection Capability
    • > 100μA Ambient Photodetector Current
    • > 70dB Ambient Rejection at 120Hz (Average Mode > 2)
  • Miniature 2.78mm x 1.71mm, 7 x 4 0.35mm Ball Pitch WLP Package
  • -40°C to +85°C Operating Temperature Range

Applications/Uses

  • Wearable Devices for Fitness, Wellness, and Medical Applications
  • Clinical Accuracy
  • Suitable for Wrist, Finger, Ear, and Other Locations
  • Optimized Performance to Detect:
  • Optical Heart Rate
  • Heart Rate Variability
  • Oxygen Saturation (SpO2)
  • Body Hydration
  • Muscle and Tissue Oxygen Saturation (SmO2 and StO2)
  • Maximum Oxygen Consumption (VO2 max)

Description

The MAX86171 is an ultra-low-power optical data acquisition system with both transmit and receive channels. On the transmitter side, the MAX86171 has nine LED driver output pins, programmable from three high-current, 8-bit LED drivers. On the receiver side, MAX86171 has two low-noise charge integrating front-ends that each include independent 19.5 bit ADCs and best-in-class ambient light cancellation (ALC) circuits, producing the highest performing integrated optical data acquisition system on the market today.

Due to its low power consumption, compact size, ease and flexibility of use, the MAX86171 is ideal for a wide variety of optical sensing applications such as pulse oximetry and heart rate detection.

The MAX86171 operates on a 1.8V main supply voltage and a 3.1V to 5.5V LED driver supply voltage. The device supports both I2C and SPI compatible interfaces in a fully autonomous way. The device has a large 256-word built-in FIFO. The MAX86171 is available in a compact 28-bump WLP package.

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal