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LDC1614: thin 6, 8, 10, 12, and 16" diameter rotary angle sensors

Vern Bunch
Intellectual 520 points
Part Number: LDC1614

hi, is ldc1614 a good solution for my design of thin 6, 8, 10, 12, and 16" diameter rotary angle sensors?  if not, what is?

I like the inductive sensing technology, and can easily make pcbs with needed copper traces.

I am seeking highest accuracy, +-.001 deg or better.

Another application is distance measuring, and the ldc1614 eval shows Stretched Coil and a Rectangular Target.  extremely high precision, wonderful.

Is this how some electronic calipers measure?

  • 0
    TI__Expert 7599 points

    Hello User,

    Thanks for taking the time to visit our inductive sensing product offerings. 

    For more information regarding the inductive sensing technology from TI its capabilities and limitations can be found in our FAQ  

    In terms of achieving angular accuracy, we have a TI-Design that demonstrate the 1Deg of angular measurement. For much higher accuracy than 1DegC I would suggest using optical encoding. Inductive sensing does have limitation to achieve <1 deg C due to the construction of the coil and the second/third order effects due to temp variations effect achieving the desired accuracy. 

    In regards to distance measurement, Its an interesting application of using LDC1614 for electronic calipers measurements, however our devices are meant for sub micron to mm measurements and not exactly meant for larger distance measurement. The limitations are due to the architecture of our device and its capability to drive the LC tank to resonance. The LC tank is typically designed using PCB coils, the principle of eddy currents and the drive capability limits our capability to measure large distance. 

  • 0
    Intellectual 520 points
    thank you very much, nice reply.  I will abandon your ldc 1614 for my design.

    for making precision calipers, 0 to 3 inches is fine.  your app shows more than 3", right?

    ...make it a great day!

    Vern / Tech Director  303-859-9476
    Metal Express Inc.
    333 N Snowmass Cir
    Superior, Colorado USA 80027

  • 0 in reply to Vern Bunch
    TI__Expert 7599 points

    Hello Vern,

    Happy to help.

    <10cm is where we typically recommend LDC devices.  The losses in the eddy currents due to target being at large distance >10cm limits the capability of the device achieving maximum resolution.

    The other alternative you can consider are Hall Sensors. Using linear hall sensors we can detect the presence of the magnet approaching. However the limitations are that now need to consider placing a magnet.