Maxim MAX35104气体流量系统级芯片(SoC)解决方案

Maxim公司的MAX35104是气体流量系统级芯片(SoC),用于超声波气体流量计和医用呼吸机的模拟前端(AFE)解决方案.具有高精度的流量测量,测量范围高达400μs,支持 PT1000和PT500 RTD传感器以及温度调节器,工作电压2.3V-3.6V,工作温度-40°C 到+85°C.本文介绍了MAX35104主要优势和特性,框图,以及评估板MAX35104 EVK主要优势和特性,框图,电路图,材料清单和PCB设计图.
The MAX35104 is a gas flow meter system-on-chip (SoC) targeted as an analog front-end solution for the ultrasonic gas meter and medical ventilator markets. With a time measurement accuracy of 700ps and automatic differen­tial time of flight (TOF), the device makes for simplified computation of gaseous flow.
Power consumption is the lowest available with ultra-low 62μA time-of-flight measurement and 125nA duty-cycled temperature measurement. Multi-hit (up to six per wave) capability with stop-enable windowing allows the device to be fine-tuned for the application. Internal analog switches, a configurable three-stage integrated operational ampli­fier chain amplifier, and an ultra-low input offset compara­tor provide the analog interface and control for a minimal electrical bill of material solution. A programmable high-voltage (up to 30V) pulse launcher provides up to 19dB of transducer launch amplitude adjustment to compensate for transducer aging and temperature, pressure, humidity affects. Early edge detection ensures measurements are made with consistent wave patterns to greatly improve accuracy and eliminate erroneous measurements. Built-in arithmetic logic unit provides TOF difference measure­ments and programmable receiver hit accumulators to minimize the host microprocessor access. For tempera­ture measurement, the device supports a single 2-wire PT1000 platinum resistive temperature detector (RTD) or NTC thermistor. A simple 4-wire SPI interface allows any microcontroller to effectively configure the device for its intended measurement.
MAX35104主要优势和特性:
High Accuracy Flow Meas...