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LDC1000: About TBCLK

Masanori Tachibana
Genius 5350 points

Part Number: LDC1000

Hello support team,

Please teach me about externally supplying clock to TBCLK terminal of LDC1000.

1. How much current is required for the drivability of clock out terminal?
2. Is it necessary to have wait time to supply clock when Power ON?
If necessary, how long time is required?
3. Is there any case to stop the clock other than standby?

Best regards,
M. Tachibana

  • 0
    TI__Genius 14270 points
    Hello Tachibana-san,

    1) The TBCLK input of the LDC1000 does not require significant current; the leakage is only ~1uA. However, parasitic capacitances on the traces will increase the current drive requirements.
    2) The supplied clock should settle within 128/fsensor after entering active mode. For a 5MHz sensor (the highest sensor frequency), the input clock should settle within 25us. If the clock takes longer than that to settle, then you should incorporate a wait time before relying on the inductance conversion results. Note that Rp measurements do not require the external clock to be stable.
    3) If you stop the clock while conversions are occurring, the LDC1000 L measurements will report either a lower sensor frequency than is present, or 0.
  • 0 in reply to Chris Oberhauser66
    Genius 5350 points
    Hello Chris-san,

    Thank you for your reply.
    Your advice is was very helpful.
    If something I do not understand comes out, please teach me again.

    Best regards,
    M. Tachibana