Precision Sensor Interface Design with Runic
This technical reference document provides detailed information about runic product specifications, characteristics, and performance parameters. Use this information to support your design and analysis activities.
Electrical characteristics are specified over the operating temperature range unless otherwise noted. Parameters are guaranteed by design, testing, or statistical analysis. Typical values is the most likely parametric norm at 25°C.
Thermal characteristics require careful attention during system design. The junction-to-ambient thermal resistance depends on the mounting configuration, PCB copper area, and airflow conditions. Use thermal simulation tools to predict operating temperatures under actual conditions.
Reliability data is based on accelerated life testing and field failure analysis. Mean time between failures (MTBF) calculations follow industry-standard methodologies. Contact BeiLuo for detailed reliability reports and qualification data.
💡 FAE Insights
⚠️ Common Pitfalls
- ✗ Using general-purpose op-amps for high-gain applications
- ✗ Not using ratiometric measurement
- ✗ Ignoring thermocouple effects
- ✗ Inadequate shielding for remote sensors
Frequently Asked Questions
1. What is ratiometric measurement and why use it?
Ratiometric measurement compares the sensor output to the excitation voltage rather than measuring absolute voltage. For a bridge sensor: Output = (Vbridge / Vexc) × Scale. Since both Vbridge and Vexc come from the same reference, any drift in the reference cancels out. This is crucial for long-term stability. Implementation: (1) Use the same voltage reference for ADC reference and sensor excitation; (2) Measure excitation voltage with ADC; (3) Calculate ratio in software. Runic's RS6220 reference with RS1240 ADC is ideal for this.