Top

Single-Supply Integrated Optical Module for HR and SpO2 Measurement

Low Power Integrated In-Ear Heart Rate Monitor

Product Details

The MAXM86161 is an ultra-low-power, completely integrated, optical data-acquisition system. On the transmitter side, the MAXM86161 has three programmable high-current LED drivers. On the receiver side, MAXM86161 consists of a high efficiency PIN photo-diode and an optical readout channel. The optical readout has a low-noise signal conditioning analog front-end (AFE), including 19-bit ADC, an industry-lead ambient light cancellation (ALC) circuit, and a picket fence detect and replace algorithm. Due to the low power consumption, compact size, easy, flexible-to-use, and industry lead ambient light rejection capability of the MAXM86161, the device is ideal for a wide variety of optical sensing applications such as heart rate detection and pulse oximetry.

The MAXM86161 operates on a 3.0V to 5.5V VLED single supply voltage. It supports a standard compatible interface and fully autonomous operation. Each device has a large 128-word built-in FIFO. The MAXM86161 is available in compact 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA package.

Key Features

  • Complete Single-Channel Optical Data Acquisition System
  • Built-In Algorithm Further Enhances Rejection of Fast Ambient Transients
  • Optimized Architecture for Reflective Heart Rate and SpO2 Monitoring
  • Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance)
  • Lower Effective Dark Current Noise Achievable through Multiple Sample Modes and On-Chip Averaging
  • High-Resolution 19-bit Charge Integrating ADC
  • Three Low-Noise 8-Bit LED Current DACs
  • Excellent Dynamic Range > 89dB in White Card Loop-Back Test (Sample-to-Sample Variance)
  • Excellent Ambient Range and Rejection Capability
    • > 100μA Ambient Photodetector Current
    • > 70dB Ambient Rejection at 120Hz
  • Ultra-Low-Power Operation for Wearable Devices
    • Low-Power Operation, Optical Readout Channel < 10μA, Typical at 25sps
    • Short Exposure Integration Period of 14.8μs, 29.4μs, 58.7μs, 117.3μs
    • Low Shutdown Current = 1.6μA (typ)
  • Miniature 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA Package
  • -40°C to +85°C Operating Temperature Range

Applications/Uses

  • Optimized for In-Ear Applications
  • Miniature Package for Mobile Applications
  • Optimized Performance to Detect:
  • Continuous Monitoring for HRV
  • Optical Heart Rate
  • Oxygen Saturation (SpO2)
Parametric specs for Bio-Sensors
Integrated LEDs Green
IR
Red
ISUPPLY (µA) (typ) 10
Shutdown Mode Supply Current (µA) (typ) 1.6
VSUPPLY (V) (min) 3
VSUPPLY (V) (max) 5
Resolution (bits) (ADC) 19
SNR (dB) 102
Oper. Temp. (°C) 0 to +70
Package/Pins OLGA/14
Budgetary
Price (See Notes)
$4.21 @1k
View More

Simplified Block Diagram

MAXM86161: Simplified Block Diagram MAXM86161: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAXM86161EVSYS# evaluation system (EV system) allows for the quick evaluation of the MAXM86161 integrated optical module for applications at various sites on the body, particularly in-ear and mobile applications. The MAXM86161 device communicates using a standard I2C-compatible interface to Maxim’s on-board MAX32664 Biometric Sensor Hub microcontroller (used for Maxim’s algorithm evaluation) or in a pass-through mode for raw data collection. The MAXM86161 device consists of three optical readout channels that can be individually controlled (Green, Red, and IR). The EV system allows for flexible configurations to allow testing of various features of the sensor. Moreover, it helps the user quickly learn how to configure and use the MAXM86161 device.

The primary EV system consists of three circuit board assemblies (MAXSensorBLE_EVKIT, MAXM86161OSBFLEX, and the Cypress CY5677 Dongle), one USB-C to USB-A connector cable, and a Lithium Polymer battery. In addition, two programming circuit boards (MAXM86161_MAX32630_PRGMR_ASSY, and the MAXREFDES100HDK) and one USB-B Micro-to-USB-A Male USB cable are provided for firmware updates if needed.

The EV system can be powered using a USB-C supply or LiPo Battery and comes with a MAXM86161EFD+ device in a 14-pin OLGA package.

The MAXM86161OSBFLEX Flex-Rigid circuit board has a Maxim Integrated MAX32664 Biometric Sensor Hub microcontroller device installed. This Sensor Hub can be used to implement Maxim’s HR/SpO2 Algorithm for evaluation. The MAXM86161 GUI PC application code that allows evaluation of both the MAXM86161EVSYS# and the MAX32664 Sensor Hub is available in the MAXM86161EVSYS# EV System Design Resources tab.

View Details

Features

  • Performance Evaluation of the MAXM86161 Sensor (e.g., SNR, Dark Current, Noise, etc.)
  • Performance Evaluation of Maxim Algorithms for Power Optimization, Heart Rate (HR), SpO2 (Peripheral Capillary Oxygen Saturation), etc. Using the On-Board MAX32664GWEC+ Biometric Sensor Hub Microcontroller
  • Facilitates Understanding of MAXM86161 Architecture and Solution Strategy
  • Real-Time Monitoring and Data Logging Capabilities
  • On-Board Accelerometer
  • Bluetooth™ LE for wireless data collection

/en/design/design-tools/ee-sim.html?

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

Parameters

Parametric specs for Bio-Sensors
Integrated LEDs Green
IR
Red
ISUPPLY (µA) (typ) 10
Shutdown Mode Supply Current (µA) (typ) 1.6
VSUPPLY (V) (min) 3
VSUPPLY (V) (max) 5
Resolution (bits) (ADC) 19
SNR (dB) 102
Oper. Temp. (°C) 0 to +70
Package/Pins OLGA/14
Budgetary
Price (See Notes)
$4.21 @1k

Key Features

  • Complete Single-Channel Optical Data Acquisition System
  • Built-In Algorithm Further Enhances Rejection of Fast Ambient Transients
  • Optimized Architecture for Reflective Heart Rate and SpO2 Monitoring
  • Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance)
  • Lower Effective Dark Current Noise Achievable through Multiple Sample Modes and On-Chip Averaging
  • High-Resolution 19-bit Charge Integrating ADC
  • Three Low-Noise 8-Bit LED Current DACs
  • Excellent Dynamic Range > 89dB in White Card Loop-Back Test (Sample-to-Sample Variance)
  • Excellent Ambient Range and Rejection Capability
    • > 100μA Ambient Photodetector Current
    • > 70dB Ambient Rejection at 120Hz
  • Ultra-Low-Power Operation for Wearable Devices
    • Low-Power Operation, Optical Readout Channel < 10μA, Typical at 25sps
    • Short Exposure Integration Period of 14.8μs, 29.4μs, 58.7μs, 117.3μs
    • Low Shutdown Current = 1.6μA (typ)
  • Miniature 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA Package
  • -40°C to +85°C Operating Temperature Range

Applications/Uses

  • Optimized for In-Ear Applications
  • Miniature Package for Mobile Applications
  • Optimized Performance to Detect:
  • Continuous Monitoring for HRV
  • Optical Heart Rate
  • Oxygen Saturation (SpO2)

Description

The MAXM86161 is an ultra-low-power, completely integrated, optical data-acquisition system. On the transmitter side, the MAXM86161 has three programmable high-current LED drivers. On the receiver side, MAXM86161 consists of a high efficiency PIN photo-diode and an optical readout channel. The optical readout has a low-noise signal conditioning analog front-end (AFE), including 19-bit ADC, an industry-lead ambient light cancellation (ALC) circuit, and a picket fence detect and replace algorithm. Due to the low power consumption, compact size, easy, flexible-to-use, and industry lead ambient light rejection capability of the MAXM86161, the device is ideal for a wide variety of optical sensing applications such as heart rate detection and pulse oximetry.

The MAXM86161 operates on a 3.0V to 5.5V VLED single supply voltage. It supports a standard compatible interface and fully autonomous operation. Each device has a large 128-word built-in FIFO. The MAXM86161 is available in compact 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA package.

Simplified Block Diagram

MAXM86161: Simplified Block Diagram MAXM86161: Simplified Block Diagram Zoom icon

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