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Overview

The MAX86181ENO is an ultra-low power optical data acquisition system with transmit and receive channels. At the transmitter end, the MAX86181 has two high-current 8-bit programmable LED drivers. The MAX86181 can drive up to 24 leds. At the receiver end, the MAX86181 features four low-noise charge-integrated front ends, each including a separate 20-bit analog-to-digital converter (ADC) and best-in-class ambient light cancellation (ALC) circuits, making for the highest performing integrated optical data acquisition system on the market today.

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

The MAX86181 integrates two Ldos and can be powered by a single 3.3V supply. The device supports I2C and SPI-compatible interfaces in a fully autonomous manner. The device has a large 1024-word built-in FIFO.

Parameters

Product: MAX86181ENO

Type: Optical AFE

Package: WLP-42

Features

Complete four-channel optical data acquisition system

Ultra-low power operation for body wearables

Low power operation, optical readout channel 17μW, 25fps

The exposure integral period ranges from 14.6μs to 118.2μs

Low turn-off current < 2.3μA

Excellent top SNR = 98.8dB(Nyquist intersample variance) in white card loopback test

Extended dynamic range up to 122dB (average and off-chip filtering)

Supports frame rates from 1fps to 1927fps

High resolution 20-bit charge-integrating analog-to-Digital Converter (ADC)

Low dark current noise of 52 pa (intersample variance in 118.2μs integration time)

Excellent environmental range and inhibition

200μA ambient photodetector current

At 120Hz, ambient light elimination is increased to more than 90dB (average = 2)

Operating temperature range -40°C to +85°C

New function

Reduced analog Front end (AFE) power consumption

Personalized sampling rate for each measurement

Low Dark Noise Mode (LDNM) supports 10pARMS of dark noise

VLED_HSx Dynamic voltage adjustment of power supply

Auto-offset DAC mode - Optional AutomaticMode that effectively extends dynamic range without microcontroller intervention

Applications

Wearable devices for fitness, health and medical applications

Suitable for wrists, fingers, ears and other positions

Optimized detection performance

Oxygen saturation (SpO2)

Heart rate detection