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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.
High Accuracy Flow Measurement for Billing and Leak Detection
Time-to-Digital Accuracy Down to 700ps Measurement Range Up to 8ms
2 Channels: Single-Stop Channel
High Accuracy Temperature Measurement for Precise Flow Calculations
One 2-Wire Sensor: PT1000, PT500 RTD, and Thermistor Support
Maximizes Battery Life with Low Device and Overall System Power
Ultra-Low 62μA TOF Measurement and 125nA Duty-Cycled Temperature Measurement
Event Timing Mode with Randomizer Reduces Host μC Overhead to Minimize System Power Consumption
2.3V to 3.6V Single-Supply Operation
High Integration Solution Minimizes Parts Count and Reduces BOM Cost
Built-In Real-Time Clock
Small, 5mm x 5mm, 40-Pin TQFN Package
-40°C to +85°C Operation
应用超声煤气表
