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TI AFE4900可穿戴无线多参数病人监护器参考设计TIDA-01580

TI公司的AFE4900是超低功耗集成模拟前端(AFE),用于同步化心电图(ECG)和光电血管容积图(PPG)信号收集,也可用于光生物检测应用如心率监测(HRM)和外周血氧饱和度(SpO2).同步PPG和ECG信号采集数据速率高达1kHz,PPG接收器动态范围高达100 dB.本文介绍了AFE4900主要特性和框图,以及采用AFE4900的可穿戴无线多参数病人监护器参考设计TIDA-01580主要特性,框图,电路图,材料清单和PCB设计图.

The AFE4900 device is an analog front-end (AFE) forsynchronized electrocardiogram (ECG),photoplethysmogram (PPG) signal acquisition. Thedevice can also be used for optical bio-sensingapplications, such as heart-rate monitoring (HRM)and saturation of peripheral capillary oxygen (SpO2).

The PPG signal chain supports up to four switchinglight-emitting diodes (LEDs) and up to threephotodiodes (PDs). The LEDs can be switched onusing a fully integrated LED driver. The current fromthe photodiode is converted into voltage by thetransimpedance amplifier (TIA) and digitized using ananalog-to-digital converter (ADC). The ECG signal chain has an instrumentation amplifier (INA) with aprogrammable gain that interfaces to the same ADC.

A right-leg drive (RLD) amplifier set can be used tothe bias for the ECG input pins. AC and dc lead-offdetect schemes are supported. The ADC codes fromthe PPG and ECG phases can be stored in a 128-sample first in, first ou

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