Ultra-low power, 1-ch integrated biopotential heart rate AFE

May 08, 2017 //By Graham Prophet
Ultra-low power, 1-ch integrated biopotential heart rate AFE
For designers of products such as chest band heart rate monitors for fitness applications, or single-lead wireless patches for at-home/in-hospital monitoring, Maxim recently issued the MAX30004, a complete, biopotential, HR detection analogue front-end IC.

The device is designed to offer high performance for clinical and fitness applications, with ultra-low power for long battery life. It provides R-R intervals [broadly speaking, the beat-to-beat time] for heart rate detection.

The biopotential channel has ESD protection, EMI filtering, internal lead biasing, DC leads-off detection, ultra-low power leads-on detection during standby mode, and is equipped with extensive calibration voltages for built-in self-test. Soft power-up sequencing ensures no large transients are injected into the electrodes. The biopotential channel also has high input impedance, low noise, high CMRR, programmable gain, various low-pass and high-pass filter options, and a high-resolution analogue-to-digital converter. The biopotential channel is DC coupled, can handle large electrode voltage offsets, and has a fast recovery mode to quickly recover from overdrive conditions, such as defibrillation and electrosurgery.


The MAX30004 comes in a 28-pin TQFN or 30-bump wafer-level package (WLP), operating over the 0°C to +70°C commercial temperature range.


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