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LDC1101: LDC1101 / RP +L Mode and LHR Mode

S.Satoshi
Guru 21675 points
Part Number: LDC1101

Hi,

Please let me ask about RP +L Mode and LHR Mode as below.

  1. In page 10 of DS, it states that the sensor Q should be at least 10 for RP measurements in RP + L mode. Then is there any limitation of Q value in LHR mode? And please let me know why there is such difference between RP + L mode and LHR mode if there is no limitation of Q value in LHR mode.
  2. In RP + L mode, it states that Q value should be at least 10. Can you please explain why you recommend at least 10? And please let me know what do you concern if we use it lower than 10 Q value in RP + L mode?
  3. In LHR mode, can we see correct operation with lower Q value than 10 if we use the sensor amplitude between 0.25 Vpk and 1.25 Vpk?

Best Regards,

Satoshi / Japan Disty

  • 0
    TI__Genius 14270 points

    Hello Satoshi-san,

    There is no real lower limit for Q when setting the device to LHR-only mode (as detailed in section 9.1.11 of the datasheet). However, you still need to make sure that the sensor frequency and sensor Rp is not outside the device limits.  Do keep in mind that a higher-Q sensor generally provides better measurement accuracy and lower noise. With LHR measurements, when the Rp measurement is disabled (datasheet section 9.1.11), then you can go lower in sensor amplitude; but you will have higher noise.

    For RP+L mode, the sensor is modulated with a triangle wave; if the Q is too low then the modulation will not be properly applied.

    Regards,

    ChrisO