Single-Supply Integrated Optical Module for HR and SpO Measurement

The MAXM86161 is an ultra-low-power, completely integrated, optical data-acquisition system. On the transmitter side, the MAXM86161 has three programmable high-current LED drivers. On the receiver side, MAXM86161 consists of a high efficiency PIN photo-diode and an optical readout channel. The optical readout has a low-noise signal conditioning analog front-end (AFE), including 19-bit ADC, an industry-lead ambient light cancellation (ALC) circuit, and a picket fence detect and replace algorithm. Due to the low power consumption, compact size, easy, flexible-to-use, and industry lead ambient light rejection capability of the MAXM86161, the device is ideal for a wide variety of optical sensing applications such as heart rate detection and pulse oximetry.

The MAXM86161 operates on a 3.0V to 5.5V VLED single supply voltage. It supports a standard compatible interface and fully autonomous operation. Each device has a large 128-word built-in FIFO. The MAXM86161 is available in compact 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA package.

Applications

* Optimized for In-Ear Applications * Miniature Package for Mobile Applications * Optimized Performance to Detect: * Continuous Monitoring for HRV * Optical Heart Rate * Oxygen Saturation (SpO2)

* Complete Single-Channel Optical Data Acquisition System

* Built-In Algorithm Further Enhances Rejection of Fast Ambient Transients

* Optimized Architecture for Reflective Heart Rate and SpO2 Monitoring

* Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance)

* Lower Effective Dark Current Noise Achievable through Multiple Sample Modes and On-Chip Averaging

* High-Resolution 19-bit Charge Integrating ADC

* Three Low-Noise 8-Bit LED Current DACs

* Excellent Dynamic Range > 89dB in White Card Loop-Back Test (Sample-to-Sample Variance)

* Excellent Ambient Range and Rejection Capability

* > 100μA Ambient Photodetector Current

* > 70dB Ambient Rejection at 120Hz

* Ultra-Low-Power Operation for Wearable Devices

* Low-Power Operation, Optical Readout Channel < 10μA, Typical at 25sps

* Short Exposure Integration Period of 14.8μs, 29.4μs, 58.7μs, 117.3μs

* Low Shutdown Current = 1.6μA (typ)

* Miniature 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA Package

* -40°C to +85°C Operating Temperature Range