Overview
Features and Benefits
- 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
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.
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![]() 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 ›
Applications
- 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 (SpO2)
- Wearable Devices for Fitness, Wellness, and Medical Applications
Product Categories
Product Lifecycle
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 (2)
Documentation & Resources
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MAX86140 Reliability Data1/12/2023PDF45K
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UG-7145: MAXREFDES103# Health Sensor Band User Guide1/15/2020PDF3M
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Wearable Optical Measurement Solution Based on the MAX326643/11/2021
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Choose the Proper PMIC to Boost Your Optical Sensor SNR8/30/2019
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Take a Weight Off Your Chest with a Wrist-Worn ECG Monitor5/9/2019
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Guidelines for the Opto-Mechanical Integration of Heart-Rate Monitors in Wearable Wrist Devices3/26/2019
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Guidelines for SpO2 Measurement3/26/2019
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Guidelines to Enhancing the Heart-Rate Monitoring Performance of Biosensing Wearables3/26/2019
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.
PCN-PDN Information
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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.