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ADI ADPD4000(1)多模式传感器前端解决方案

ADI公司的ADPD4000是多模式传感器前端,有8 个输入通道, 具有多种工作模式以适应以下测量如PPG,ECG,EDA,阻抗和温度.有12 个可编程时隙,适用于同步传感器测量. 灵活的采样速率从0.004 Hz 至 9 kHz,片内集成了数字滤波,发射和接收信号链的SNR为90 dB,环境光抑制为60 dB 至 1 kHz,支持 SPI 和 I2C 通信, 256 字节 FIFO.主要用在可穿戴健康和健美监视器如心率监视仪(HRM),心律变异(HRV),应力,血压估计, SpO2,水化(合)作用,体躯成分.工业监测如CO,CO2,烟雾,气溶胶检测以及家庭病人监测.本文介绍了ADPD4000/1主要特性,功能框图, 模拟信号通路框图以及评估板EVAL-ADPD4000Z-PPG和EVAL-ADPDUCZ连接图,评估板EVAL-ADPD4000Z-PPG主要特性,电路图和PCB设计图.

The ADPD4000/ADPD4001 operate as a complete multimodal sensor front end, stimulating up to eight LEDs and measuring the return signal on up to eight separate current inputs. Twelve time slots are available, enabling 12 separate measurements per sampling period.

The data output and functional configuration utilize an I2C interface on the ADPD4001 or a serial port interface (SPI) on the ADPD4000. The control circuitry includes flexible LED signaling and synchronous detection. The devices use a 1.8 V analog core and 1.8 V/3.3 V compatible digital input/output (I/O).

The analog front end (AFE) rejects signal offsets and corruption from asynchronous modulated interference, typically from ambient light, eliminating the need for optical filters or externally co

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