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LDC1312: difference in resolution of parts: LDC1314 (12 bit) and LDC1614 (28 bit).

Todd Keppler
Prodigy 180 points
Part Number: LDC1312
Other Parts Discussed in Thread: LDC1314, LDC1614, LDC1612

I have a question about the TI LDC ICs.  There are two different resolution parts:  LDC1314 (12 bit)  and LDC1614 (28 bit).  I would like to know more about the differences in these ICs and how they should be used.  

Does the 28bit device extend your sensing range ?   What applications would require higher 28bit resolution part?

Regards,

TK

  • 0
    TI__Genius 17440 points

    Hi TK,

    While the biggest determination of the sensing range is the diameter of the sensor coil, the extra resolution of the LDC1612 can improve the sensing range. Most LDC devices (including the LDC131x) can detect conductive targets at a distance of up to 100% of the sensor coil diameter. The LDC1612 can detect up to 200% of the sensor coil diameter. The LDC1314 can also support up to 16 bits of resolution using its internal gain setting. If the target is at the edge of your sensing range or if you need to detect minuscule (sub-micron) changes in target distance, the high resolution of the LDC161x devices will be necessary. If the application does not require extremely high precision or the target can be located very close to the sensor, the LDC131x resolution should be enough. In addition, the LDC131x devices can support a much faster sample rate than the LDC161x devices, which matters more than very high precision in some applications. If you have not found it already, the LDC Device Selection Guide may help you further.

    Regards,

  • 0 in reply to Kristin Jones93
    Prodigy 180 points

    Hi Kristin,

    what is or where is  the sample rate of the 2 chips is defined.  I did not find that in the device data sheet.  

    Regards,

    TK

  • 0 in reply to Todd Keppler
    TI__Genius 17440 points
    Hi TK,

    The Maximum Channel Sample Rate is specified in the Sensor section of the Electrical Characteristics table (section 6.5) in both the LDC131x and LDC161x datasheets. It is also listed in the LDC Device Selection Guide.

    Regards,