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What is the maximum inductance (how many uH) LDC1000 can driver?

Jimmy Chou
Prodigy 90 points


Hello experts:

   We're now planing to replace "Hall senser+ADC" with LDC1000 "Axial distance Measurement".

Because of we need a linear variation with a long distance about 2cm. We want to use maximum uH to test it.

Could you please tell me what is the maximum value TI have tested bfore or how can calculate the maximum value?

And what is the longest distance of "Axial distance Measurement" TI have ever test?

Thanks

Jimmy Chou  

  • 0
    TI__Genius 9300 points

    There is no single number to answer this question. LDC1000 has a limitation of the value of Rp (equivalent parallel resistance) that it can measure (800 to 4M Ohms). Rp = L/Rs/C, where Rs is equivalent serial resistance, C – cap value.

    Coil design governs both L and Rs, and for different coil designs the ratio of L/Rs is different. The smaller the cap, the higher Rp will become, thus making smaller coils possible. Larger coils will limit the data rate, unless the cap value is very small.


    We are in the process of testing coils with 6 to 24mHr for detection range of ~10cm. But there is no limiting factors to go higher L or further distances - it's all in sensor design.