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Analog Devices / Maxim Integrated MAX30004 Integrated Biopotential HR Detection AFE

Analog Devices MAX30004 Integrated Biopotential HR Detection AFE is a complete, biopotential HR detection analog front-end (AFE) solution for wearable applications, especially chest straps, and patches. It offers high performance for clinical and fitness applications, with ultra-low power for long battery life. The Analog Devices MAX30004 is a single biopotential channel providing R-R intervals for heart rate detection. The biopotential channel has ESD protection, EMI filtering, internal lead biasing, and DC leads-off detection. It also includes ultra-low power leads on detection during standby mode and 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 and can handle large electrode voltage offsets. This channel also has a fast recovery mode to quickly recover from overdrive conditions, such as defibrillation and electrosurgery.

Features

  • 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 a 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
    • 85µW 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)

Applications

  • Chest Band Heart Rate Monitors for Fitness Applications
  • Single Lead Wireless Patches for At-Home/In-Hospital Monitoring

Functional Diagram

Analog Devices / Maxim Integrated MAX30004 Integrated Biopotential HR Detection AFE
Published: 2017-06-21 | Updated: 2023-04-17