First,Overview of AFE analog front-end chip ADX911AQFN32
ADX911AQFN32 is a high-performance multi-channel synchronous sampling AFE analog front-end chip,which is equipped with 16-bit Delta-Sigma high-precision analog-to-digital conversion architecture and integrates core modules such as programmable gain amplifier,internal reference source and on-board oscillator.AFE analog front-end chip can accurately adapt to low-power scenarios such as portable medical ECG acquisition,exercise and fitness monitoring,and can directly replace ADS1191 chip.With its high integration and high stability,it can effectively reduce the size of the equipment,reduce the power consumption and R&D and production costs of the whole machine,and is the preferred device for medical bioelectricity monitoring equipment.
Second,the performance advantages of AFE analog front-end chip ADX911AQFN32
1.Sampling and gain performance
This AFE analog front-end chip has flexible performance configuration capability,and the data rate can be adjusted in a wide range from 125SPS to 8kSPS,which can adapt to different precision signal acquisition requirements.The built-in programmable gain amplifier in AFE analog front-end chip supports multi-gear gain adjustment of 1,2,3,4,6,8 and 12,and the input reference noise is as low as 24μVPP.With a high common-mode rejection ratio of-100dB,it can accurately capture weak bioelectrical signals,effectively avoid environmental signal interference and ensure the accuracy of collected data.Its input bias current is only 800pA,which greatly improves the stability of weak signal detection.
2.Adaptability between power supply and environment
In terms of power supply design,AFE analog front-end chip supports unipolar and bipolar power supply modes,with the power supply range of 2.7V-5.5V for analog signals and 1.65V-3.6V for digital signals,which is suitable for most portable equipment power supply schemes.At the same time,it has strong environmental adaptability,and its working temperature covers a wide temperature range from-40℃to 85℃.It can run stably in complex industrial,outdoor and portable equipment scenes,and prevent abnormal work caused by temperature fluctuation.
Third,the function and configuration of AFE analog front-end chip ADX911AQFN32
The AFE analog front-end chip ADX911AQFN32 is highly integrated with diversified practical functions,and has a built-in right leg driver amplifier,lead drop detection module and test signal unit,which can complete the complete acquisition and monitoring of ECG signals without external auxiliary circuits.AFE analog front-end chip is equipped with SPI-compatible serial interface,supports timeout reset function,and has stable communication and strong adaptability.At the same time,it integrates the functions of power supply monitoring,internal temperature sensing and over-range detection,and with flexible power-off and standby low-power consumption modes,further optimizes the performance of equipment energy consumption.The chip adopts a small package of 4mm×4mm QFN32,which complies with IEC 60601-2-47 industry standard,can completely replace the traditional ADS1191 chip,and is suitable for mass production of various lightweight and high-precision bioelectric monitoring equipment.
Keywords:AFE analog front-end chip
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