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

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

Product Details

The MAX86140/MAX86141 are ultra-low-power, com- pletely integrated, optical data acquisition systems. On the transmitter side, the MAX86140/MAX86141 have three programmable high-current LED drivers that can be configured to drive up to six LEDs using an external 3x2:1 mux. With two MAX86140/MAX86141 devices working in master-slave mode, the LED drivers can drive up to twelve LEDs using an external 3x2:1 mux. On the receiver side, MAX86140 consists of a single optical readout channel, while the MAX86141 has two optical readout channels that can operate simultaneously. The devices have 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 func- tion. Due to the low power consumption, compact size, ease of use, and industry-lead ambient light rejection capability of MAX86140/MAX86141, the devices are ideal for a wide variety of optical-sensing applications, such as pulse oximetry and heart rate detection.

The MAX86140/MAX86141 operate on a 1.8V main supply voltage and a 3.1V to 5.5V LED driver supply voltage. Both devices support a standard SPI compatible interface and fully autonomous operation. Each device has a large 128-word built-in FIFO. The MAX86140/MAX86141 is available in compact wafer-level package (WLP) (2.048 x 1.848mm) with 0.4mm ball pitch.


Introducing the MAX-HEALTH-BAND Heart Rate and Activity Monitor

 
Wristband Health Monitoring Demo with MAX86141

Design Solution: REALLY Smart Wearables Customize Their Power Supply ›

Design Solution: Choose the Proper PMIC to Boost Your Optical Sensor SNR ›

Design Solution: Take a Weight Off Your Chest with a Wrist-Worn ECG Monitor ›

Design Solution: Designing for Wearable Health and Fitness? Think Inside the Box ›

Design Solution: Train Your Fitness Monitor to Deal with Any Lighting Conditions ›

Key Features

  • Complete Single-Channel, Optical Data Acquisition System
  • Optimized Architecture for Transmissive and Reflective Heart Rate or 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)
  • Dynamic Range Extendable to >104dB for SpO2 and >110dB for HRM with Multiple Sample Modes and On-Chip Averaging
  • Excellent Ambient Range and Rejection Capability
    • > 100µA Ambient Photodetector Current
    • > 70dB Ambient Rejection at 120Hz
  • Ultra-Low-Power Operation for Body 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 = 0.6µA (typ)
  • Rejection of Fast Ambient Transients
  • Miniature 2.048 x 1.848mm, 5 x 4 0.4mm Ball Pitch WLP
  • -40°C to +85°C Operating Temperature Range

Applications/Uses

  • Muscle Oxygen Saturation (SmO2 and StO2)
  • Optical Heart Rate
  • Optimized for Wrist, Finger, Ear, and Other Locations
  • Optimized Performance for High Quality PPG Signal to Detect
  • Oxygen Saturation
  • Wearable Devices for Fitness, Wellness, and Medical Applications
Parametric specs for Bio-Sensors
ISUPPLY (µA) (typ) 10
Shutdown Mode Supply Current (µA) (typ) 0.6
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 19
SNR (dB) 102
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/20
Budgetary
Price (See Notes)
$3.20 @1k
View More

Simplified Block Diagram

MAX86140, MAX86141: Detailed Block Diagram MAX86140, MAX86141: Detailed Block Diagram Zoom icon

Design & Development

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

Description

The MAX86140/MAX86141 Evaluation System (EVSYS) allows for the quick evaluation of the MAX86140 and MAX86141 optical AFE for applications at various sites on the body, particularly the wrist. Both MAX86140 and MAX86141 supports standard SPI compatible interface. MAX86140 consists of a single optical readout channels, while MAX86141 has two optical readout channels that operate simultaneously. The EVSYS allows flexible configurations to optimize measurement signal quality at minimal power consumption. The EVSYS helps the user quickly learn about how to configure and use the MAX86140 and MAX86141.

The EVSYS consists of three boards. MAXSensor BLEEK# is the main data acquisition board while MAX86140OSBEK# and MAX86141OSBEK# are the sensor daughter boards for MAX86140 and MAX86141 respectively. The EVSYS can be powered using the USB-C supply or LiPo Battery.

The EVSYS comes with a MAX86140ENP+/MAX86141-ENP+ in a 24-bump wafer-level package (WLP).


Wristband Health Monitoring Demo with MAX86141

Design Solution: Train Your Fitness Monitor to Deal with Any Lighting Conditions ›

View Details

Features

  • Quick Evaluation of the MAX86140/MAX86141
  • Supports Optimization of Configurations
  • Facilitates Understanding MAX86140/MAX86141 Architecture and Solution Strategy
  • Real-time Monitoring
  • Data Logging Capabilities
  • On-Board Accelerometer
  • Bluetooth LE

Description

The MAX-HEALTH-BAND wrist-worn heart-rate and activity monitor provides a simplified means to extract high-accuracy vital signs and raw data from health sensors for wearable designs. This unique evaluation and development platform uses the MAX86140 optimized optical pulse-oximeter/heart-rate sensor and the MAX20303 wearable power management solution, and showcases Maxim’s motion-compensated health sensor algorithms. The MAX-HEALTH-BAND streams algorithm output and raw data from the health sensors via Bluetooth® onto a smartphone app for customized algorithm development. The platform is also available for white-box license.

In addition to raw PPG and accelerometer data, the MAX-HEALTH-BAND monitors steps, activity classification, heart rate, and interbeat intervals for heart-rate variability. The MAX-HEALTH-BAND comes with a wrist-worn heart-rate and activity band, a USB charging cable, and instructions for downloading the Android-based application.

Download the application ›

Design Solution: Designing for Wearable Health and Fitness? Think Inside the Box ›

View Details

Features

  • Monitors and Streams Activity and Heart Rate to an Android® Mobile App
  • Collects Beat-to-Beat Physiological Data about the Heart
  • Provides Access to Raw Data from Sensors and Algorithm Output
  • Algorithm Output Data Includes Heart Rate, Heart-Rate Variability, Step Count, and Activity Classification
  • Eliminates up to 9 Months of Design Time for Building and Prototyping
  • Requires Less Than Half the Power and One-Third the Space of Other Solutions
  • Runs for Up to 7 Days on a Single Charge

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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
ISUPPLY (µA) (typ) 10
Shutdown Mode Supply Current (µA) (typ) 0.6
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 19
SNR (dB) 102
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/20
Budgetary
Price (See Notes)
$3.20 @1k

Key Features

  • Complete Single-Channel, Optical Data Acquisition System
  • Optimized Architecture for Transmissive and Reflective Heart Rate or 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)
  • Dynamic Range Extendable to >104dB for SpO2 and >110dB for HRM with Multiple Sample Modes and On-Chip Averaging
  • Excellent Ambient Range and Rejection Capability
    • > 100µA Ambient Photodetector Current
    • > 70dB Ambient Rejection at 120Hz
  • Ultra-Low-Power Operation for Body 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 = 0.6µA (typ)
  • Rejection of Fast Ambient Transients
  • Miniature 2.048 x 1.848mm, 5 x 4 0.4mm Ball Pitch WLP
  • -40°C to +85°C Operating Temperature Range

Applications/Uses

  • Muscle Oxygen Saturation (SmO2 and StO2)
  • Optical Heart Rate
  • Optimized for Wrist, Finger, Ear, and Other Locations
  • Optimized Performance for High Quality PPG Signal to Detect
  • Oxygen Saturation
  • Wearable Devices for Fitness, Wellness, and Medical Applications

Description

The MAX86140/MAX86141 are ultra-low-power, com- pletely integrated, optical data acquisition systems. On the transmitter side, the MAX86140/MAX86141 have three programmable high-current LED drivers that can be configured to drive up to six LEDs using an external 3x2:1 mux. With two MAX86140/MAX86141 devices working in master-slave mode, the LED drivers can drive up to twelve LEDs using an external 3x2:1 mux. On the receiver side, MAX86140 consists of a single optical readout channel, while the MAX86141 has two optical readout channels that can operate simultaneously. The devices have 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 func- tion. Due to the low power consumption, compact size, ease of use, and industry-lead ambient light rejection capability of MAX86140/MAX86141, the devices are ideal for a wide variety of optical-sensing applications, such as pulse oximetry and heart rate detection.

The MAX86140/MAX86141 operate on a 1.8V main supply voltage and a 3.1V to 5.5V LED driver supply voltage. Both devices support a standard SPI compatible interface and fully autonomous operation. Each device has a large 128-word built-in FIFO. The MAX86140/MAX86141 is available in compact wafer-level package (WLP) (2.048 x 1.848mm) with 0.4mm ball pitch.


Introducing the MAX-HEALTH-BAND Heart Rate and Activity Monitor

 
Wristband Health Monitoring Demo with MAX86141

Design Solution: REALLY Smart Wearables Customize Their Power Supply ›

Design Solution: Choose the Proper PMIC to Boost Your Optical Sensor SNR ›

Design Solution: Take a Weight Off Your Chest with a Wrist-Worn ECG Monitor ›

Design Solution: Designing for Wearable Health and Fitness? Think Inside the Box ›

Design Solution: Train Your Fitness Monitor to Deal with Any Lighting Conditions ›

Simplified Block Diagram

MAX86140, MAX86141: Detailed Block Diagram MAX86140, MAX86141: Detailed Block Diagram Zoom icon

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.