Maxim MAXM86161单电源光学模块HR和SpO2测量方案

摘要: Maxim公司的MAXM86161是超低功耗全集成的单电源光学数据采集系统.发送端, MAXM86161具有三个可编大电流的LED驱动器;而接收端, MAXM86161包括高效率PIN光电二极管和光读出通路. 光读出通路具有低噪音信号调理模拟前端(AFE),包括19位ADC,一个行业领先的环境光取消(ALC)电路,栅状检测和替代算法.由于MAXM86161的低功耗,紧凑的尺寸,容得和灵活使用,业界一流的环境光抑制功能,使得器件非常适合各种光学检测应用如心率检测和脉搏血氧仪.MAXM86161暗电流噪音小于50pA RMS,具有三个低噪音8位LED电流DAC, 白卡回环测试中的动态范围大于89dB,120Hz时环境光抑制大于78dB,光电管环境光电流大于100μA,工作环境温度-40°C到 +85°C.主要用在耳内应用,移动应用的微型包装,光心率检测, 氧饱和度(SpO2)检测和心率变异性(HRV)连续监测.本文介绍了MAXM86161主要优势和特性,简化框图以及评估系统MAXM86161EVSYS#主要特性,框图和包括MAXM86161OSBFLEX和MAXSensorBLE的电路图,材料清单和PCB设计图.
 The MAXM86161 is an ultra-low-power, completely integrated, optical data-acquisition system. On the transmitter side, the MAXM86161 has three programmable high-current LED drivers. On the receiver side, MAXM86161 consists of a high efficiency PIN photo-diode and an optical readout channel. The optical readout has a low-noise signal conditioning analog front-end (AFE), including 19-bit ADC, an industry-lead ambient light cancellation (ALC) circuit, and a picket fence detect and replace algorithm. Due to the low power consumption, compact size, easy, flexible-to-use, and industry lead ambient light rejection capability of the MAXM86161, the device is ideal for a wide variety of optical sensing applications such as heart rate detection and pulse oximetry.
The MAXM86161 operates on a 3.0V to 5.5V VLED single supply voltage. It supports a standard compatible interface and fully autonomous operation. Each device has a large 128-word built-in FIFO. The MAXM86161 is available in compact 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA package.
MAXM86161主要优势和特性:
Complete Single-Channel Optical Data Acquisition...