[原创] TI TIDA－00378PM2．5粒子传感器模拟前端参考设计

TI公司的TIDA-00378是PM2.5和PM10粒子传感器模拟前端(AFE)参考设计,基于OPA320单个和OPA2320双路运算放大器,PM2.5 (<2.5µm)和PM10 (<10µm)粒子检测和尘埃测量范围从340 x 103到991 x 103 pcs/ft3 (12 - 35 pcs/cm3),AFE输入电压3.3V,平均电流13mA,主要用在空气质量和气体检测以及环境传感器.本文介绍了OPA320主要特性,以及TIDA-00378主要特性和指标,传感器框图和电路图,材料清单和PCB设计图.

The OPA320 (single) and OPA2320 (dual) are a new generation of precision, low-voltage CMOS operational amplifiers optimized for very low noise and wide bandwidth while operating on a low quiescent current of only 1.45mA.

The OPA320 series is ideal for low-power, single-supply applications. Low-noise (7nV/√Hz) and high-speed operation also make them well-suited for driving sampling analog-to-digital converters (ADCs). Other applications include signal conditioning and sensor amplification.

The OPA320 features a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of typically 114dB over the full input range. The input common-mode range extends 100mV beyond the negative and positive supply rails. The output voltage typically swings within 10mV of the rails.
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