Ultra-low power 85microwatt, single-channel integrated biopotential AFE
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
next page; feature list…
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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