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LDC1614EVM: Inductance measurement and its value range of LDCs

Kishoraditya Chaudhari1
Prodigy 20 points
Part Number: LDC1614EVM
Other Parts Discussed in Thread: LDC1614

What is the range or minimum and maximum value of inductance that can be measured using LDC 1614, if used for inductance measurement purposes?

I am trying to find a solution to measure a variety of very small inductance values in a broad range of 10nH to 50uH. While just surfing around a found out about LDCs, Even though its primary task isn't to measure value of inductance I guess that can be accomplished by removing the sensor portion in the evm, right? I would primarily like to know the inductance range of LDC1614 EVM so that I can work on whether or not it can be further manipulated to measure values of my choice?

  • 0
    TI__Expert 7599 points

    Hello User, 

    Thanks for your question in regards to LDC portfolio of devices. The LDC1614 is an inductance to digital converter device. The fundamental principles of LDC and its operation on using the device can be found here on our FAQ. 

    https://e2e.ti.com/support/sensors/f/1023/t/295036

    The LDC portfolio of devices are really meant for measuring the target distance from the coil. The coil is wound in a PCB that creates an inductance. Depending on the proximity and the target size and distance detection the PCB coil size needs to designed appropriately. As the target moves closer to the coil the eddy currents are absorbed by the target, due to change in the eddy current the resonance frequency shifts. LDC1614 is able to detect the change in resonance and report the changes via I2C. Its isn't really reporting inductance but a change in resonance frequency is reported back. 

    Let me know if this helps! 

  • 0 in reply to Arjun_Prakash
    Prodigy 20 points

    The LDC when connected to its sensor reports back the change in its inductance, but if we remove the sensor and connect another inductor, won't it give inductance value?

    Also, it would be great if you can help me know what is the minimum value of change in inductance it can detect.

    And I read in its datasheet that it can be made precise or its accuracy can be increased by increasing its frequency using external clock at TBCLK, does that mean I can manipulate its extreme limits of detection?

    I also don't know if that makes any sense, but thank you for trying to make me understand.

  • 0 in reply to Kishoraditya Chaudhari1
    TI__Expert 7599 points

    LDC are designed to work for metal proximity applications. 

    The LDC family of devices do indicate the change in resonance frequency due to the change in inductance. Your assessment of measuring inductance is correct. If you are looking for a gross inductance measurement LDC (+/- 30%) LDC could be used and needs to be tried out. 

    Let us know if you need any help here!