MAX86171
Low-Noise AFE for Pulse Oximeter and Heart Rate Monitor
Best-in-Class SNR for Addressing Low Perfusion & New Use Cases
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Overview
Features and Benefits
- Complete Dual-Channel Optical Data Acquisition System
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Ultra Low-Power Operation for Wearable Devices
- Low-Power Operation, Optical Readout Channel < 11µA at 25fps
- Exposure Integration Period Ranging from 14.6µs to 117.1µs
- Low Shutdown Current < 1µA
- Excellent Top-End Dynamic Range > 91dB in White Card Loop-Back Test (Nyquist Sample-to-Sample Variance)
- Extended Dynamic Range up to 110dB (Averaging and Off-Chip Filtering)
- Supports Frame Rates from 1fps to 2.9kfps
- High Resolution 19.5-Bit Charge Integrating ADCs
- Supports Four PD Inputs for Multi-Parameter Measurements
- Supports Nine LED Driver Output Pins Generated from Three 8-Bit LED Current Drivers
- Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance in 117.1µs Integration Time)
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Excellent Ambient Range and Rejection Capability
- > 200μA Ambient Photodiode Current
- > 70dB Ambient Rejection at 120Hz (Average Mode > 2)
- Miniature 2.78mm x 1.71mm, 7 x 4, 0.35mm Ball Pitch WLP Package
- -40°C to +85°C Operating Temperature Range
Product Details
The MAX86171 is an ultra-low-power optical data acquisition system with both transmit and receive channels. On the transmitter side, the MAX86171 has nine LED driver output pins, programmable from three high-current, 8-bit LED drivers. On the receiver side, MAX86171 has two low-noise charge integrating front-ends that each include independent 19.5 bit ADCs and best-in-class ambient light cancellation (ALC) circuits, producing the highest performing integrated optical data acquisition system on the market today.
Due to its low power consumption, compact size, ease and flexibility of use, the MAX86171 is ideal for a wide variety of optical sensing applications such as pulse oximetry and heart rate detection.
The MAX86171 operates on a 1.8V main supply voltage and a 3.1V to 5.5V LED driver supply voltage. The device supports both I2C and SPI compatible interfaces in a fully autonomous way. The device has a large 256-word built-in FIFO. The MAX86171 is available in a compact 28-bump WLP package.
Applications
- Wearable Devices for Fitness, Wellness, and Medical Applications
- Clinical Accuracy
- Suitable for Wrist, Finger, Ear, and Other Locations
- Optimized Performance to Detect:
- Optical Heart Rate
- Heart Rate Variability
- Oxygen Saturation (SpO2)
- Body Hydration
- Muscle and Tissue Oxygen Saturation (SmO2 and StO2)
- Maximum Oxygen Consumption (VO2 max)
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 (1)
Documentation & Resources
Tools & Simulations
IBIS Models
IBS
MAX86171 IBIS Model
1.55M
Reference Designs (1)
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.
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