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LDC1000: time delay

K.Hamamoto
Guru 12155 points

Part Number: LDC1000

Hi

Our customer have some question about time delay of power mode.

How much is the time delay from active mode to standby mode and from standby mode to active mode?

(It means the delay is from the oscillation stop to start and from start to stop.)

If there are some delay, also how much is the variation of the delay? (10% or 20% or more?)

Best Regards,

Koji Hamamoto

  • 0
    TI__Genius 17440 points

    Hi Koji,

    Are you interested in the time delay between standby and active mode because you want to duty cycle the device to reduce power consumption? If this is the case, I would recommend using the LDC2114 instead, which has internal duty cycling. In general, TI does not recommend using the LDC1000 for new designs. 

    Regards,

  • 0 in reply to Kristin Jones93
    Guru 12155 points
    Hi Kristin-san,

    Thank you. I know this device is NRND. However they need to proceed with this device current model anyway. In the future they understand they need to change other LDC device.

    So that ,they would like to know how much is the time delay.(from Standby to active mode. from active mode to standby mode.) Also if it has some delay time, I would like to know how much the variation of the delay.

    Best Regards,
    Koji Hamamoto
  • 0 in reply to K.Hamamoto
    Guru 12155 points
    Hi Kristin-san,

    Could follow this?

    The customer use some LDC1000 and each LDC1000 is operated at not same time.
    (i.g. #1 LDC operate and stop. Then after that #2 LDC will operate.)

    Best Regards,
    Koji Hamamoto
  • 0 in reply to K.Hamamoto
    TI__Genius 17440 points

    Hi Hamamoto-san,

    Apologies for the delay in responding to your question. I've looked through the LDC1000 validation data, and unfortunately the time delay when transitioning between standby mode and active mode was not tested. However, this value will be insignificant compared to the time it takes to finish the first conversion after transitioning from standby mode to active mode. This first conversion could take 3-4 times longer than all other conversions in active mode. The normal conversion time can be calculated using equation 6 on page 24 of the LDC1000 datasheet and will depend on the sample rate the customer has selected. 

    Regards,

  • 0 in reply to Kristin Jones93
    Guru 12155 points
    Hi Kristin-san,

    Thank you for the information. Our customer understood.
    Please close this post.

    Best Regards,
    Koji Hamamoto