Ultra-low power 85microwatt, single-channel integrated biopotential AFE

Ultra-low power 85microwatt, single-channel integrated biopotential AFE

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Maxim Integrated has posted preliminary information on its MAX30003, which is a complete, biopotential, analogue front-end solution for wearable, clinical and fitness applications, with ultra-low power for long battery life. The MAX30003 is a single biopotential channel providing ECG waveforms and heart rate detection.
By Graham Prophet

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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 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 analogue-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. It comes in a 28-pin TQFN and 30-bump wafer-level package (WLP), operating over the 0°C to +70°C commercial temperature range.

 

Use the device, Maxim suggests, in bio-authentication and ECG-on-demand applications; chest band heart rate monitors for fitness applications; single lead event monitors for arrhythmia detection; and single lead wireless patches for at-home/in-hospital monitoring.

 

Maxim Integrated; www.maximintegrated.com/en/products/analog/data-converters/analog-front-end-ics/MAX30003

 

 

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MAX 30003 features include;

 

Clinical-grade ECG AFE with high-resolution data converter

15.5 bits effective resolution with 5µVP-P noise

Better dry starts due to 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 > 500 MΩ 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 use 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

85µW at 1.1V supply voltage

Leads-on interrupt µC to stay in deep sleep mode with RTC off 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 FIFO waking µController every 256 msec with full ECG acquisition

High-speed SPI interface

Shutdown current of 0.5 µA (typ)

 

 

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