MAX86140/
MAX86141
Best-in-Class Optical Pulse Oximeter and
Heart-Rate Sensor for Wearable Health
General Description
Benefits and Features
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. With two
MAX86140/MAX86141 devices working in master-slave
mode, the LED drivers can drive up to twelve LEDs.
On the receiver side, MAX86140 consists of a single
opticalreadoutchannels,whiletheMAX86141hastwoopti-
cal 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 algorithm. Due to the low power consumption,
compact size, easy/flexible-to-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.
● Complete Single and Dual-Channel Optical Data
Acquisition System
● Built-in Algorithm Further Enhances Rejection of Fast
Ambient Transients
● Optimized Architecture for Transmissive and
Reflective Heart Rate or SpO Monitoring
2
● 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 > 90dB in White Card
Loop-Back Test (Sample-to-Sample Variance)
● Dynamic Range Extendable to > 104dB for SpO
2
and > 110dB for HRM with Multiple Sample Modes
and On-Chip Averaging
The MAX86140/MAX86141 operate on a 1.8V main
supply voltage and a 3.1~5.5V 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.
● 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 (typ) at 25sps
• Short Exposure Integration Period of 14.8μs,
29.4μs, 58.7μs, 117.3μs
• Low Shutdown Current = 20μW (typ)
Applications
● Wearable Devices for Fitness, Wellness and Medical
Applications
● Built-in Algorithm Further Enhances Rejection of Fast
Ambient Transients
● Miniature 2.048 x 1.848mm, 5 x 4 0.4mm Ball Pitch WLP
● Optimized for Wrist, Finger, Ear, and Other Locations
● Optimized Performance to Detect
• Optical Heart Rate
● -40°C to +85°C Operating Temperature Range
• Oxygen Saturation (SpO )
2
• Muscle Oxygen Saturation (SmO and StO )
2
2
Ordering Information appears at end of data sheet.
19-100051; Rev 1; 8/17