1.Introduction of analog front-end chip solution
The analog front-end chip ADX920 series is specially designed for ECG,sports and fitness application scenarios,which integrates the original complex multi-component system into a compact device.The analog front-end chip integrates all the functions commonly needed by portable low-power medical electrocardiogram(ECG),sports and fitness applications.
2.analog front-end chip function
The analog series analog front-end chip of Yingshang Micro Agent further optimizes the signal chain design on the basis of ADX920.ADX920 analog front-end chip has excellent high integration,and each channel is equipped with a flexible input multiplexer,which can independently connect internally generated test signals,temperature detection modules and lead drop detection functions.The analog front-end chip can support the data output rate of 8kSPS at most,and can meet different bandwidth requirements from resting electrocardiogram to dynamic heart rate monitoring.Its working temperature range is–-40°C to 85°C,and it can maintain stable conversion accuracy even in high and low temperature or humidity changing environment.
3.Simulate the front-end chip characteristics
ADX920 series analog front-end chips also integrate a low-noise programmable gain amplifier(PGA)and a 24-bit high-precisionδ-σanalog-to-digital converter(ADC),which can effectively capture weak bioelectrical signals and suppress common-mode interference.The characteristics of multi-channel synchronous sampling make it particularly outstanding in multi-lead ECG equipment-all channels can be converted at the same time to ensure the consistency of waveform time axis.
4.Simulate some parameter characteristics of the front-end chip
•Input reference noise:8.6μVPP(G=6).
•Input bias current:100pA.
•Data rate:125SPS to 8kSPS.
•Programmable gain:1,2,3,4,6,8 or 12.
•Analog Front-end Chip Integrated Analog PACE Measurement(ADX921/2/3).
•Power monitor,internal temperature sensor,OSC fault detection,over-range detection.
•SPI™compatible serial interface,timeout reset.
•Support ADC data FIFO to reduce polling time of external devices to save power.
•The analog front-end chip supports the system conforming to IEC 60601-2-47 standard.
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