First,the domestic AFE analog front-end industry application
Under the general trend of domestic upgrading of medical monitoring equipment,high-performance afe analog front-end has become the core component of portable monitors and ECG detection equipment.Traditional imported analog front-end chips have high cost and long delivery cycle,which restricts the popularization and iteration of domestic medical equipment.With the core advantages of high integration,low power consumption and high stability,the domestic afe analog front-end perfectly adapts to the signal acquisition requirements of multi-parameter monitors for home and medical use,and can accurately capture the weak ECG signal of human body and complete the whole process of signal amplification,noise reduction and analog-to-digital conversion.It is the key device for the domestic replacement of medical monitoring equipment.
Second,ADX920 series AFE analog front-end performance advantages
ADX920/1/2/3 series is a multi-channel synchronous sampling afe analog front-end chip specially developed for medical scenes.It is equipped with a 24-bitΔ-σanalog-to-digital converter,integrated with a programmable gain amplifier,an internal reference voltage source and an oscillator,without a large number of peripheral discrete devices,which greatly simplifies the hardware circuit design.This series of chips focuses on low power consumption and high integration characteristics,and accurately matches scenes such as ECG monitoring and sports health sign collection,which can help equipment manufacturers to reduce product volume,reduce overall production cost and power consumption,and meet the R&D and production needs of lightweight and portable monitors.
1.Flexible function configuration and stable working conditions
Each channel of AFE analog front-end chip is equipped with independent input multiplexer,which supports various functions such as test signal acquisition,temperature detection and lead drop monitoring.The channel configuration can be customized to realize the adaptation of right leg drive output signal,which meets the requirements of multi-scene debugging and use of the monitor.The equipment can support up to 8kSPS data sampling rate,and with the built-in excitation current module,it can efficiently complete the lead drop detection.Among them,ADX922 and ADX923 models integrate exclusive respiratory impedance measurement function,which can realize one-stop monitoring of ECG and respiratory parameters.The chip can run stably in a wide temperature environment from-40℃to 85℃,and is suitable for complex working conditions such as hospital wards,home care and outdoor first aid.
2.Highlights of core parameters of ADX921AQFN32 model
As a series of explosion models,ADX921AQFN32,the AFE analog front end,adopts 4mm×4mm QFN32 micro package to save the internal space of the equipment.The device is equipped with dual-channel low-noise PGA and two sets of 24-bit high-precision ADC,single-channel signal acquisition mode,high sampling rate of 16Ksps,and SPI high-speed communication interface,so the data transmission is efficient and stable.Under the working condition of G=6,the input reference noise is as low as 8.6μVPP,which can effectively filter environmental interference and ensure the accuracy of ECG signal acquisition.It is the preferred model for domestic afe analog front-end monitor.
Keywords:AFE analog front-end
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