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

Industry's Smallest PPG AFE for Space Constrained Wearables

Product Details

Key Features

Parametric specs for Bio-Sensors
ISUPPLY (µA) (typ) 11uA @ 25sps
Shutdown Mode Supply Current (µA) (typ) 0.5
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 20
SNR (dB) 110
Oper. Temp. (°C) 0 to +70
Package/Pins THIN WLP/16
Budgetary
Price (See Notes)
2.52
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Simplified Block Diagram

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Parameters

Parametric specs for Bio-Sensors
ISUPPLY (µA) (typ) 11uA @ 25sps
Shutdown Mode Supply Current (µA) (typ) 0.5
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 20
SNR (dB) 110
Oper. Temp. (°C) 0 to +70
Package/Pins THIN WLP/16
Budgetary
Price (See Notes)
2.52

Key Features

  • Complete Optical Data Acquisition System
  • Ultra-Low-Power Operation for Body Wearable Devices
    • Low-Power-Operation, Optical Readout Channel < 11µA (typ) at 25fps
    • Exposure Integration Period Ranging from 14.6µs to 117.1µs
    • Low Shutdown Current < 1µA (typ)
  • Excellent Top-End Dynamic Range > 93dB in White Card Loop-Back Test (Nyquist Sample-to-Sample Variance)
  • Extended Dynamic Range up to 111dB (Averaging and Off-Chip Filtering) to Enable SpO2 on Wrist/Chest for Low Perfusion Cases
  • Support Frame Rates from 1fps to 2.9kfps
  • High-Resolution 20-Bit Charge-Integrating ADCs
  • Support Both Burst Averaging and Decimation Averaging Modes
  • On-Chip 12Hz Low-Pass Filter for Improved SNR and Reduced Power for Continuous Heart-Rate Measurement
  • Supports Two PD Inputs for Multi-Parameter Measurements
  • Supports Four LED Driver Output Pins Generated from Two 8-Bit LED Current Drivers
  • Low Dark-Current Noise of < 50pARMS (Sample-to-Sample Variance in 117.1µs Integration Time)
  • Excellent Ambient Range and Rejection Capability
    • 200µA Ambient Photodiode Current
    • > 70dB Ambient Rejection at 120Hz (Burst Average > 2)
  • Miniature 1.67mm x 1.78mm, 0.4mm Ball Pitch, 4 x 4 WLP Package
  • -40°C to +85°C Operating Temperature Range

Applications/Uses

  • Body Hydration
  • Clinical Accuracy
  • Heart-Rate Variability
  • Maximum Oxygen Consumption (VO2 max)
  • Muscle and Tissue Oxygen Saturation (SmO2 and StO2)
  • Optical Heart Rate
  • Optimized Performance to Detect
  • Oxygen Saturation (SpO2)
  • Suitable for Wrist, Finger, Ear, and Other Locations
  • Wearable Devices for Fitness, Wellness and Medical Applications

Description

The MAX86174A/MAX86174B are ultra-low-power optical data acquisition systems with both transmit and receive channels. On the transmitter side, the MAX86174A/MAX86174B have four LED driver output pins. Each pin is programmable from two, high-current, 8-bit LED drivers. On the receiver side, the MAX86174A consists of two optical readout channels that can operate simultaneously while the MAX86174B has a single optical readout channel. The devices have low-noise, charge-integrating analog front-end, 20-bit ADC, and best-in-class ambient-light cancellation (ALC) circuits.

Due to the low power consumption, compact size, ease and flexibility of use, the MAX86174A/MAX86174B are ideal for a wide variety of optical sensing applications such as pulse oximetry and heart-rate detection.

The MAX86174A/MAX86174B operate on a 1.8V main supply voltage and a 3.1V to 5.5V LED driver supply voltage. The devices support both I²C- and SPI-compatible interfaces in a fully autonomous way. The devices have a large 256-word built-in FIFO. The MAX86174A/MAX86174B are available in a compact 16-WLP package.

Simplified Block Diagram

Technical Docs

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 .