MAX86181

The MAX86181 is an ultra-low power optical data acquisition system with both transmit and receive channels. On the transmitter side, the MAX86181 has two, high-current 8-bit programmable LED drivers. The MAX86181 can drive up to 24 LEDs. On the receiver side, the MAX86181 has four low-noise charge integrating front ends such that each includes independent 20-bit analog-to-digital converters (ADCs) and best-in-class ambient light cancellation (ALC) circuits, producing the highest performing integrated optical data acquisition system in the market today.

Due to its low power consumption, compact size, ease and flexibility of use, the MAX86181 is ideal for a wide variety of optical sensing applications such as pulse oximetry and heart rate detection.

Working with one of Analog Devices, Inc.’s dynamic voltage scaling/DVS-enabled power management integrated circuit (PMIC), the MAX86181’s DVS circuit can dynamically minimize the LED’s anode voltage for every measurement (every wavelength and LED current) ensuring optimal SNR while reducing power dissipation on the V_{LED_HSx} rail.

The MAX86181 operates on a 2.5V analog supply voltage, a 3.1V to 5.5V VLED_DRV driver supply voltage, and a 1.8V digital supply voltage. With two integrated LDOs, the MAX86181 can operate on a single 3.3V supply. The device supports both I²C and SPI compatible interfaces in a fully autonomous way. The device has a large 1024-word built-in FIFO. The MAX86181 is available in a compact 42-WLP package.

Applications

• Wearable Devices for Fitness, Wellness, andMedical Applications
• Suitable for Wrist, Finger, Ear, and Other Locations
• Optimized Performance to Detect
  • Heart Rate
  • Heart Rate Variability
  • Oxygen Saturation (SpO2) both Transmissive and Reflective
  • Body Hydration Optical Spectroscopy