Ultra-Low-Power, Single-Channel Integrated Biopotential (ECG, R-to-R, and Pace Detection) and Bioimpedance (BioZ) AFE

Description

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The MAX30001 is a complete, biopotential and bioimpedance (BioZ), analog front-end (AFE) solution for wearable applications. It offers high performance for clinical and fitness applications, with ultra-low power for long battery life. The MAX30001 is a single biopotential channel providing electrocardiogram (ECG) waveforms, heart rate and pacemaker edge detection, and a single bioimpedance channel capable of measuring respiration.

The biopotential and bioimpedance channels have ESD protection, EMI filtering, internal lead biasing, DC leads-off detection, 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. Both channels also have 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 electro-surgery. The bioimpedance channel includes integrated programmable current drive, works with common electrodes, and has the flexibility for 2 or 4 electrode measurements. The bioimpedance channel also has AC lead off detection.

The MAX30001 is available in a 30-bump wafer-level package (WLP), operating over the 0°C to +70°C commercial temperature range.

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How to Measure Bioimpedance (Bio-Z) with the MAX30001EVSYS

Make High-Accuracy Biopotential and BioZ Measurements with MAX30001

Key Features

• Can be Used in IEC 60601-2-47:2012 Compliant Systems
• Clinical-Grade ECG AFE with High-Resolution Data Converter
  • 15.9 Bits ENOB with 3.1µV_PP (typ) Noise for ECG
  • 17 Bits ENOB with 1.1µV_PP Noise for BioZ
• 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 > 1GΩ for Extremely Low Common-to-Differential Mode
• 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 65mV_P-P or ECG and 90mV_P-P for BioZ Will Help Prevent Saturation in the Presence of Motion/Direct Electrode Hits
• Longer Battery Life Compared to Competing Solutions
  • 85µW at 1.1V Supply Voltage for ECG
  • 158µW at 1.1V Supply Voltage for BioZ
• Leads-On Interrupt Feature Allows to Keep the µC in Deep Sleep Mode Until Valid Lead Condition is Detected
  • Lead-On Detect Current: 0.7µA (typ)
• Built-In Heart Rate Detection with Interrupt Feature Eliminates the Need to Run HR Algorithm on the μController
  • Robust R-R Detection in High Motion Environment at Extremely Low Power
• Configurable Interrupts Allows the µC Wake Up Only on Every Heart Beat Reducing the Overall System Power
• High Accuracy Allows for More Physiological Data Extractions
• 32-Word ECG and 8-Word BioZ FIFOs Allows the MCU to Stay Powered Down for 256ms with Full Data Acquisition
• High-Speed SPI Interface
• Shutdown Current of 0.6µA (typ)

Applications/Uses

• Bio Authentication and ECG-On-Demand Applications
• Chest Band Heart Rate Monitors for Fitness Applications
• Impedance Based Heart Rate Detection
• Respiration and Hydration Monitors
• Single-Lead Event Monitors for Arrhythmia Detection
• Single-Lead Wireless Patches for In-Patient/Out-Patient Monitoring