Maxim MAX30004 bio-potential analog front end powers wearable healthcare at any time for health checks

Maxim Integrated's MAX30004 bio-potential analog front-end (AFE) is a single-channel bio-potential heart rate monitoring AFE solution for wearable medical applications. It can be used in heart rate chest straps and single-lead wireless heart rate patch products. Electrocardiogram (ECG) data is extracted and processed in the microcontroller.

The Maxim MAX30004 AFE provides a single biopotential channel to measure the R-R wave spacing of the heartbeat to determine heart rate. This bio-potential channel provides electrostatic discharge (ESD) protection, electromagnetic interference (EMI) filtering, and DC lead-off detection. The MAX30004 provides a wide range of calibration voltages for the built-in self-test function, and its soft power-up sequence ensures that there are no large transient signal injection electrodes.

The MAX30004's fully differential input structure provides high common-mode rejection ratio (CMRR) over 100 dB and high impedance over 500 MOhm, improving common-mode to differential-mode conversion capability. The 0.7 mA lead-on feature allows the AFE's microcontroller to remain in deep sleep mode while keeping the real-time clock off until a valid lead condition is detected. Configurable interrupts allow the microcontroller to wake up on every heartbeat, reducing overall system power consumption.

The MAX30004 has a DC bias range of up to ±650mV (1.8V typical) and can be used with a variety of electrodes. The device's ultra-low power consumption is only 85 mW at 1.1 V, so its battery life is longer than its competitors.

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Author：Brittany Antonia （The author of article owns the copyright.）