Precision Sensor Measurement Solution

Application

Description

A complete precision measurement solution using Lingxing IC 24-bit sigma-delta ADC with integrated PGA for high-accuracy sensor interfaces. This solution provides exceptional resolution, low noise, and flexible gain settings for weigh scales, pressure sensors, temperature measurement, and bridge sensors.

Core Advantages

Applications

Weigh scales and load cells

Pressure sensors

Temperature measurement

Bridge sensors

Strain gauges

Precision instrumentation

Technical Specifications

FAE Expert Insights

Senior FAE

Applications Engineer

10+ years

Professional Insights

Match PGA gain to sensor output for optimal noise performance Use differential inputs to reject common-mode noise Implement proper PCB layout with star grounding Select appropriate output data rate for noise vs speed trade-off Use external precision reference for highest accuracy Key considerations: Optimized for target applications; Integrated design reduces BOM cost; Comprehensive technical support available. Common pitfalls to avoid: Insufficient PGA gain resulting in poor noise performance; Single-ended inputs in noisy environments causing erratic readings; Inadequate power supply decoupling increasing noise; Ignoring thermal drift in high-precision applications; Poor PCB layout causing ground loop issues.

Key Takeaways

Optimized for target applications
Integrated design reduces BOM cost
Comprehensive technical support available

Decision Framework

Steps:

Evaluate requirements
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Ready to Implement This Solution?

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Frequently Asked Questions

What types of sensors work best with this solution?

The Precision Sensor Measurement Solution works with various sensor types: Load cells and weigh scales - ideal for the high resolution and PGA gain. Pressure sensors - both bridge and amplified types. Temperature sensors - thermocouples, RTDs, thermistors. Strain gauges - for force and torque measurement. Bridge sensors - any Wheatstone bridge configuration. Sensor requirements: Output voltage within PGA-adjusted range (typically mV to V). Bridge configuration (2mV/V, 3mV/V typical for load cells). Stable excitation voltage. The 24-bit resolution enables measurement of microvolt-level signals, making it suitable for sensors with very low output levels. The integrated PGA eliminates the need for external amplification in most cases.

Works with any bridge sensor or low-level voltage output sensor. Contact our FAE team for sensor compatibility.

How do I calibrate the measurement system?

Calibrating the precision measurement system involves several steps: Zero calibration: Apply zero load/pressure/temperature. Read ADC output. Store zero offset value. Subtract from all future readings. Span calibration: Apply known full-scale input. Read ADC output. Calculate gain factor. Store calibration coefficient. Linearization (if needed): Apply multiple known inputs. Create lookup table or polynomial. Compensate for sensor non-linearity. Temperature calibration: Calibrate at multiple temperatures. Store temperature coefficients. Apply compensation in software. Calibration procedure: Ensure stable conditions during calibration. Use reference standards traceable to NIST. Take multiple readings and average. Store calibration data in non-volatile memory. Verify calibration with check points. The LX2448's excellent linearity (±10ppm) minimizes the need for linearization in most applications.

Implement zero and span calibration for accuracy. Contact our FAE team for calibration procedures.

What is the achievable accuracy with this solution?

The achievable accuracy depends on multiple factors: ADC performance: 24-bit resolution, ~20 effective bits. ±10ppm INL linearity. Low noise with proper filtering. System factors: Sensor accuracy and stability. Reference voltage accuracy. Temperature drift. Noise and interference. Calibration quality. Typical achievable accuracy: Weigh scales: 1/10,000 to 1/20,000 of full scale. Pressure sensors: 0.05% to 0.1% of full scale. Temperature: 0.1°C to 0.5°C (depending on sensor). Voltage measurement: 0.01% to 0.05% of reading. To maximize accuracy: Use external precision reference (<5ppm drift). Implement temperature compensation. Use proper shielding and grounding. Perform regular calibration. Use appropriate filtering and averaging. The solution provides the precision needed for most industrial and instrumentation applications.

Achievable accuracy 0.01% to 0.1% depending on implementation. Contact our FAE team for accuracy optimization.