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[原创] Maxim MAX30003生物电势模拟前端(AFE)解决方案

关键词:医疗电子 心电图(ECG) MAX30003

时间:2018-04-03 10:33:11       作者:Maxim       来源:中电网

Maxim公司的MAX30003是用于可穿戴设备的超低功耗单路生物电势模拟前端(AFE)解决方案,提供ECG波形和心率检测,具有ESD保护,EMI滤波,内部电极偏压,DC电极断开检测,待机模式超低功耗电极接通检测,以及内置自测的校准电压,主要用于心律失常检测的单导联线监视器,家庭/医院监测的单导联线无线贴片,用于健身的胸带心率监测器以及生物认证和心电图按需应用.本文介绍了MAX30003主要特性和优势,框图和应用框图,以及MAX30003主要特性和优势,电路图和材料清单.

Ultra-Low Power, Single-Channel Integrated Biopotential (ECG, R to R Detection) AFE he MAX30003 is a complete, biopotential, analog frontendsolution for wearable applications. It offers highperformance for clinical and fitness applications, withultra-low power for long battery life. The MAX30003 is asingle biopotential channel providing ECG waveforms andheart rate detection.

The biopotential channel has ESD protection, EMI filtering,internal lead biasing, DC leads-off detection, ultra-lowpower leads-on detection during standby mode, and extensivecalibration voltages for built-in self-test. Soft power-upsequencing ensures no large transients are injected intothe electrodes. The biopotential channel also has highinput impedance, low noise, high CMRR, programmablegain, various low-pass and high-pass filter options, anda high resolution analog-to-digital converter. Thebiopotential channel is DC coupled, can handle largeelectrode voltage offsets, and has a fast recovery modeto quickly recover from overdrive conditions, such asdefibrillation and electrosurgery.

The MAX30003 is available in a 28-pin TQFN and30-bump wafer-level package (WLP), operating over the0℃ to +70℃ commercial temperature range.The MAX30003 is a complete, biopotential, analog frontendsolution for wearable applications. It offers highperformance for clinical and fitness applications, withultra-low power for long battery life. The MAX30003 is asingle biopotential channel providing ECG waveforms andheart rate detection.

The biopotential channel has ESD protection, EMI filtering,internal lead biasing, DC leads-off detection, ultra-lowpower leads-on detection during standby mode, and extensivecalibration voltages for built-in self-test. Soft power-upsequencing ensures no large transients are injected intothe electrodes. The biopotential channel also has highinput impedance, low noise, high CMRR, programmablegain, various low-pass and high-pass filter options, anda high resolution analog-to-digital converter. Thebiopotential channel is DC coupled, can handle largeelectrode voltage offsets, and has a fast recovery modeto quickly recover from overdrive conditions, such asdefibrillation and electrosurgery.

The MAX30003 is available in a 28-pin TQFN and30-bump wafer-level package (WLP), operating over the0℃ to +70 ℃ commercial temperature range.

MAX30003主要特性和优势:

●● Clinical-Grade ECG AFE with High-Resolution DataConverter
• 15.5 Bits Effective Resolution with 5μVP-P Noise
●● Better Dry Starts Due to Much Improved Real WorldCMRR and High Input Impedance
• Fully Differential Input Structure with CMRR > 100dB
●● Offers Better Common-Mode to Differential ModeConversion Due to High Input Impedance
• High Input Impedance > 500MΩ for Extremely LowCommon-to-Differential Mode Conversion
●● Minimum Signal Attenuation at the Input During DryStart Due to High Electrode Impedance
●● High DC Offset Range of ±650mV (1.8V, typ) Allowsto Be Used with Wide Variety of Electrodes
●● High AC Dynamic Range of 65mVP-P Will Help theAFE Not Saturate in the Presence of Motion/DirectElectrode Hits
●● Longer Battery Life Compared to Competing Solutions
• 85μW at 1.1V Supply Voltage
●● Leads-On Interrupt Feature Allows to KeepμC inDeep Sleep Mode with RTC Off Until Valid LeadCondition is Detected
• Lead-On Detect Current: 0.7μA (typ)
●● Built-In Heart Rate Detection with Interrupt FeatureEliminates the Need to Run HR Algorithm on theμController
• Robust R-R Detection in High Motion Environmentat Extremely Low Power
●● Configurable Interrupts Allows the μC Wake-Up Only onEvery Heart Beat Reducing the Overall System Power
●● High Accuracy Allows for More Physiological DataExtractions
●● 32-Word FIFO Allows You to Wake Up μControllerEvery 256ms with Full ECG Acquisition
●● High-Speed SPI Interface
●● Shutdown Current of 0.5μA (typ)

MAX30003应用:

●● Single-Lead Event Monitors for Arrhythmia Detection
●● Single-Lead Wireless Patches for At-Home/In-Hospital Monitoring
●● Chest Band Heart Rate Monitors for Fitness Applications
●● Bio Authentication and ECG-On-Demand Applications

图1.MAX30003功能框图

图2.MAX30003带差分和共模滤波的两端工作电路

图2.MAX30003用于健身两电极心率监视器框图

扩展板MAX30003WING

The MAX30003WING is an expansion board designed to help engineers and students alike to rapidly prototype ECG applications for wearables using the MAX30003 biopotential analog front end. The form factor is a small 0.9in by 2.0in dual-row header footprint that is compat­ible with breadboards and featherboards from Maxim and Adafruit®, as well as additional expansion boards called wings. Two grove connectors and a 6-pin Pmod™ connector are also included for additional connectivity to popular development boards offered by Seeed Studio® and Digilent®.

The MAX30003WING expansion board is designed to provide a compact rapid development platform for the MAX30003 biopotential AFE. A 3.5mm jack has been provided for prototyping with ECG leads that support this interface. Two 4-pin grove connectors allow for integra­tion of additional I2C and UART sensors from the Seeed Studio Grove ecosystem. The dual inline pinout and form-factor for this board are based on the Adafruitfeath­erboard series, and it is intended to be compatible with many of their boards, but it is not guaranteed to work with all of them

扩展板MAX30003WING主要特性:

Expansion Board 0.9in x 2.0in DIP Form Factor Breadboard Compatible
Feather Compatible
6-Pin PMOD Compatible Socket I2C
Two Optional GPIO
Two Grove Connectors I2C
UART
3.5mm Jack for ECG Leads
MAX30003 Biopotential AFE Clinical-Grade ECG AFE with High-Resolution Data Converter 15.5 Bits Effective Resolution with 5μVP-P Noise
Longer Battery Life Compared to Competing Solutions 85μW at 1.1V Supply Voltage
Built-In Heart Rate Detection with Interrupt Feature Eliminates the Need to Run HR Algorithm on the Microcontroller
Robust R-R Detection in High-Motion Environment at Extremely Low Power
32-Word FIFO Allows You to Wake Up Microcon­troller Every 256ms with Full ECG Acquisition

图3.扩展板MAX30003WING外形图

图4.扩展板MAX30003WING电路图
扩展板MAX30003WING材料清单:

详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX30003.pdf
https://datasheets.maximintegrated.com/en/ds/MAX30003WING.pdf
MAX30003.pdf
MAX30003WING.pdf

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