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LDC1000: Amplitude default setting

Nishant Pol
Prodigy 170 points
Other Parts Discussed in Thread: LDC1612, LDC1614, LDC1312, LDC1314, LDC1101

The amplitude setting is set to the default value of 3, which is marked as "Reserved" on the datasheet.  Initially we reconfigured the Amplitude setting to 4V (2) to get maximum sensitivity, however the proximity output would occasionally fluctuate outside of the normal noise floor.  Normally the proximity output would fluctuate around 0x500 LSB, though occasionally we would notice the output change by 0x1000 LSB or more in one sample, then return to the normal noise floor. 

Changing the amplitude setting back to 3, the default value, has fixed this problem, though we are curious why this setting works even though it is marked as reserved.

  • 0
    TI__Genius 13650 points
    Hi Nishant,
    the amplitude setting of '11' is a test mode that is not supported.

    Have you verified that RP_MIN/RP_MAX and that the CFB capacitor are chosen correctly according tot he guidelines?

    Have you considered using one of our newer devices for this application? They offer many advantages over the LDC1000:
    - The high-resolution multi-channel LDCs (LDC1612, LDC1614) are L-only devices which offer greatly improved measurement accuracy, better part-to-part variation, lower power consumption, easier design integration, and multiple channels.
    - The mid-resolution multi-channel LDCs (LDC1312, LDC1314) are L-only devices which offer better part-to-part variation, lower power consumption, easier design integration, and multiple channels.
    - The high-resolution, high-speed LDC1101 supports both L- and RP-measurements, greatly improved measurement accuracy, better part-to-part variation, lower power consumption, and easier design integration.