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ADI ADPD4100-1多模式传感器前端解决方案

ADI公司的ADPD4100/ADPD4101是完整的多模式传感器前端,激励多达八个发光二极管(LED),并在多达单独电流输入端测量返回信号.有12种时间隙可用,在取样周期内可进行12种单独的测量.ADPD4101的数据输出和功能配置采用I2C接口,而ADPD4100采用SPI.控制电路包括灵活的LED信令和同步检测.器件采用1.8V模拟核和1.8V/3.3V兼容的数字输入/输出(I/O).有8个LED驱动器,其中4个可同时驱动.采用内部振荡器可灵活进行取样,从0.004 Hz 到 9 kHz,片上数字滤波,发送和接收信号链的SNR为100dB.AC环境光抑制高达1kHz时为60dB,总LED峰值驱动电流为400mA,总系统功耗为30 μW,支持SPI和I2C通信,512比特FIFO.主要用在可穿戴健康和健身监视器如HRM,HRV,应力,血压估计,SpO2,水合作用和人体成分监测仪.本文介绍了ADPD4100/ADPD4101主要特性,功能框图和评估板EVAL-ADPD4100Z-PPG主要特性,电路图和PCB设计图.

The ADPD4100/ADPD4101 operate as a complete multimodal sensor front end, stimulating up to eight light emitting diodes (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 ADPD4101 or a serial port interface (SPI) on the ADPD4100. 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, typica

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