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Best-in-Class Optical Pulse Oximeter and
Heart-Rate Sensor AFE for Wearable Health
MAX86174A/MAX86174B
General Description
Benefits and Features
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 op-
tical readout channels that can operate simultaneously
while the MAX86174B has a single optical readout chan-
nel. The devices have low-noise, charge-integrating ana-
log front-end, 20-bit ADC, and best-in-class ambient-light
cancellation (ALC) circuits.
● 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)
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.
● Extended Dynamic Range up to 111dB (Averaging
and Off-Chip Filtering) to Enable SpO on Wrist/Chest
2
for Low Perfusion Cases
● Support Frame Rates from 1fps to 2048fps
● 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
The MAX86174A/MAX86174B operate on a 1.8V main
supply voltage and a 2.7V to 5.5V LED driver supply
2
voltage. The devices support both I C- and SPI-compat-
ible 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.
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
● Low Dark-Current Noise of < 50pA
(Sample-to-
RMS
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)
• Heart-Rate Variability
• Oxygen Saturation (SpO )
2
• Body Hydration
• Muscle and Tissue Oxygen Saturation (SmO and
● Miniature 1.67mm x 1.78mm, 0.4mm Ball Pitch, 4 x 4
WLP Package
2
StO )
● -40°C to +85°C Operating Temperature Range
2
• Maximum Oxygen Consumption (VO2 Max)
19-100999; Rev 2; 7/23
Ordering Information appears at end of datasheet.
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