MAX30001GCWV+

Analog Front End (AFE) Overview

The MAX30001GCWV+ is a single-channel biopotential and bioimpedance analog front-end (AFE) designed for wearable applications, specifically targeting galvanic skin response (GSR) and electrodermal activity (EDA). It integrates an ECG channel with a 18-bit Sigma-Delta ADC and a BioZ channel with a 20-bit Sigma-Delta ADC. The device operates on analog and digital supplies from 1.1V to 2.0V, with a logic interface supply of 1.65V to 3.6V. Key electrical parameters include an ECG input referred noise of 3.1μVP-P (typical), a CMRR exceeding 100dB, and a shutdown current of 0.6μA. It features integrated heart rate detection, DC/AC lead-off detection, and extensive calibration capabilities.

Analog Front End (AFE) Feature Summary

• Integrated Biopotential and Bioimpedance AFE: Combines ECG and GSR/EDA measurement in a single 30-bump WLP package.
• High-Resolution Data Conversion: Features an 18-bit ADC for the ECG channel and a 20-bit ADC for the BioZ channel.
• Ultra-Low Power Consumption: Consumes as low as 85μW for ECG and 158μW for BioZ at 1.1V supply voltage.
• Built-in Heart Rate Detection: Includes a robust R-to-R detector that eliminates the need for continuous MCU processing.

Analog Front End (AFE) Applications

• Continuous and On-Demand ECG Applications
• Stress Monitoring Using GSR/EDA Techniques
• Single-Lead Event Monitors for Arrhythmia Detection
• Chest Band Heart Rate Monitors
• Wearable Fitness and Wellness Devices

Analog Front End (AFE) Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or direct manufacturer channels. Confirm RoHS compliance status via the specific ordering suffix documentation. Ensure the procurement source provides valid traceability records for medical-grade electronic components.

Analog Front End (AFE) Selection Notes

Select this component when designing wearable devices requiring simultaneous ECG and GSR monitoring. It is suitable for systems needing clinical-grade accuracy with ultra-low power constraints. Verify that the application environment supports the commercial temperature range of 0°C to +70°C and utilizes a 30-bump WLP footprint.

Analog Front End (AFE) Part Context

The MAX30001G belongs to the MAX3000x family of biopotential AFEs. Unlike the standard MAX30001, the 'G' variant is optimized for consumer wearable applications focusing on stress detection via Galvanic Skin Response. It shares the same package and core architecture but targets specific wellness metrics alongside standard cardiac monitoring.

Analog Front End (AFE) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices for current production status and potential obsolescence management strategies.

Analog Front End (AFE) FAQ

What is the maximum differential AC input range for the ECG channel?

At a supply voltage of 1.8V, the maximum differential AC input range is ±32.5mVP-P. At 1.1V, it is limited to ±15mVP-P.

How does the device handle electrode dry starts?

The device offers better dry starts due to high input impedance (>1GΩ) and improved real-world CMRR (>100dB), which minimizes signal attenuation even with high electrode impedance.

What is the purpose of the RBIAS pin?

The RBIAS pin allows for the connection of an external low temperature coefficient resistor to bias the internal current generator. If an external bias generator is not used, this pin can be left floating.