Ultra-low power, 1-ch integrated biopotential heart rate AFE: Page 2 of 2

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.


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 > 500MΩ 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)





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