Ultra-Low-Power, Clinical-Grade Vital-Sign AFE

The MAX86178 is a highly integrated, multiple vital-sign monitoring device with a complete photoplethysmogram (PPG), electrocardiogram (ECG) and biopotential (BioZ) analog front end (AFE) for wearable applications. The MAX86178 offers high performance for wellness and clinical applications with low power for long battery life.

The PPG data acquisition system supports up to 6 LEDs and 4 photodiode inputs. The LEDs are programmable from two high-current, 8-bit LED drivers. The receive path has two low-noise, high-resolution readout channels that each include independent 20-bit ADCs and industry-leading ambient light cancellation (ALC) circuits, producing the highest performing integrated optical data acquisition system on the market today.

The ECG channel has EMI filtering, internal lead biasing, right-leg drive, and extensive calibration voltages for built-in self-test. The ECG channel also has high-input impedance, low noise, high CMRR, programmable gain, an anti-aliasing low-pass filter, and a high-resolution ADC. It is designed to meet IEC 60601-2-47 Ambulatory ECG Systems monitoring compliance requirements.

The BioZ receive channel has EMI filtering and extensive calibration features. The BioZ receive channel also has high input impedance, low noise, programmable gain, low-pass and high-pass filter options, and a high-resolution ADC. There are several modes for generating input stimulus: balanced square-wave source/sink current, sine-wave current, and both sine-wave and square-wave voltage stimuli. A wide range of stimulus magnitudes and frequencies is available.

The MAX86178 has DC and AC lead-off detection, a flexible timing system, and a PLL. All three sensor channels are synchronized. The MAX86178 is available in a 7 x 7 49-bump wafer-level package (WLP) with package dimensions of 2.77mm x 2.57mm, and operates over -40°C to +85°C temperature range.

Applications

* Ambulatory Heart Monitors * Impedance Cardiography/Hemodynamic Monitors * Pulse Arrival Time (PAT), Pulse Travel Time (PTT), Pulse Wave Velocity (PWV) Assessments * Pulse-Oximetry Devices * Single- and Multi-Frequency Bioimpedance Analysis * Smart-Clothing Applications * Wearable Vital-Sign Monitors

* PPG

* Dual-Channel Optical Data-Acquisition System-

* 115dB SpO2 System SNR; 112dB SNR at 16µA

* Excellent Ambient Range and Rejection Capability

* > 200µA Ambient Photodetector Current

* > 90dB Ambient Rejection at 120Hz with Averaging

* ECG

* Clinical Grade ECG Acquisition System

* 15.3 ENOB with 0.72μVRMS (0.05Hz to 40Hz)

* 230fARMS Input-Current Noise (0.05Hz to 40Hz, +25°C)