Analog Devices / Maxim Integrated MAX8614x Pulse Oximeter & Heart-Rate Sensor
Analog Devices MAX86140 and MAX86141 Optical Pulse Oximeter and Heart-Rate Sensor is an optical data acquisition system with three programmable high-current LED drivers that can be configured to drive up to six LEDs. The LED drivers can drive up to twelve LEDs with two MAX86140/1 devices working in master-slave mode. The MAX86140/1 has a low-noise signal conditioning analog front-end (AFE) on the receiver side. The sensor includes a 19-bit ADC, an industry-lead ambient light cancellation (ALC) circuit, and a picket fence detects and replace algorithm. The Analog Devices MAX86140 and MAX86141's low power consumption, compact size, and ambient light rejection capability make sit ideal for a wide variety of optical sensing applications like pulse oximetry and heart rate detection.
Features
- Complete Single-Channel, Optical Data Acquisition System
- Built-in Algorithm Further Enhances Rejection of Fast Ambient Transients
- 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 >90dB 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
- Ultralow-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 = 20μW Typical
- Built-in Algorithm Further Enhances Rejection of Fast Ambient Transients
- Miniature 2.048x1.848mm, 5x4 0.4mm Ball Pitch WLP
- -40°C to +85°C Operating Temperature Range
Applications
- Wearable Devices for Fitness, Wellness, and Medical Applications
- Optimized for Wrist, Finger, Ear, and Other Locations
- Optimized Performance to Detect
- Optical Heart Rate
- Oxygen Saturation (SpO2)
- Muscle Oxygen Saturation (SmO2 and StO2)
Additional Resources
Simplified Block Diagram
Associated Development Tool
Analog Devices / Maxim Integrated MAX86140EVSYS Evaluation System
For quick evaluation of the MAX86140 optical AFE and supports a standard SPI compatible interface.
Related Product
Analog Devices / Maxim Integrated MAX32664 Ultralow Power Biometric Sensor Hub
Features embedded firmware and algorithms for wearables.
Published: 2017-08-21
| Updated: 2023-04-14