Heart rate detection front-end IC for clinical, fitness apps

Heart rate detection front-end IC for clinical, fitness apps

New Products |
By Rich Pell

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 analog-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.

Feature listing:

• Heart rate detection with interrupt feature eliminates the need to extract and process the ECG data on the microcontroller

• Robust R-R detection in high motion environment at extremely low power

• Clinical-grade biopotential AFE with high-resolution data converter

• 15.5 bits effective resolution with 5µVP-P noise

• Better dry starts due to much improved real world CMRR and high input impedance

• fully differential input structure with CMRR > 100dB

• Offers better common-mode to differential mode conversion due to high input impedance

• High input impedance > 500MO for extremely low common-to-differential mode conversion

• Minimum signal attenuation at the input during dry start due to high electrode impedance

• High DC offset range of ±650mV (1.8V, typ) allows to be used with wide variety of electrodes

• High AC Dynamic range of 65mVP-P will help the AFE not saturate in the presence of motion/direct electrode hits

• Longer battery life compared to competing solutions

• 85 µW at 1.1V supply voltage

• Leads-on interrupt feature keeps µC in deep sleep mode with RTC off until valid lead condition is detected

• Lead-on detect current: 0.7µA (typ)

• Configurable interrupts allows the µC wake-up only on every heart beat reducing the overall system power

• High-speed SPI interface

• Shutdown current of 0.5µA (typ)

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.

Maxim Integrated:

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