LDC1000 Temperature Compensation 德州仪器（LDC1000温度补偿德州仪器）.pdfVIP

Application Report SNAA212– September 2013 LDC1000 Temperature Compensation Evgeny Fomin ABSTRACT LDC1000 is a high-precision Inductance-to-Digital converter with internal precision of 0.1% over dynamic range. However, other factors may influence measurement precision greatly, dominating the system performance. One of these is temperature variation. This App Note will discuss the physical effects of temperature variation on inductive sensing and provide methods to mitigate these effects. Contents 1 Introduction 1 2 Temperature Variation Effects on System Parameters 1 2.1 R Variation 1 P 2.2 Inductance Variation 2 3 Mitigation 4 3.1 RP Measurement with Temperature Correction 4 3.2 Multi-Coil Design 5 4 References 6 1 Introduction The LDC1000 precisely measures the characteristics of a sensor (LC oscillator) to detect the presence of a conductive target. The characteristics of the coil need to be suited to the specific application, and any changes in the coil will affect the measurement sensitivity and accuracy. Shifts in the operating temperature of the system may need to be considered for the impact on some applications. 2 Temperature Variation Effects on System Parameters Inductive sensing is based on measuring the variation of inductance, L, and resonance imp