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THS788: Power consumption when doing less than 100 measurements per second

Eric Bader32
Prodigy 30 points
Part Number: THS788

Hi,

We have been using the THS788 for a year on our first product.

We are starting the design of our new product where power is very limited.

To give a little background, we would have three channels but only one channel would be measured at a time at around 80 measurements per second.

I was wondering if there were any way we could reduce the current consumption and go lower than 420mA at 3.3V as we have a really low measurement rate?

Would stopping the input clock reduce the power? If yes, by how much?

  • 0
    TI__Guru 62930 points
    Eric,
    Unfortunately, there is not a method to lower the power and still be able to take timestamps.
    Disabling the clock would cause the PLL to unlock, and increase the amount of time to relock before being able to take a new measurement.
    You can disable the channel and re-enable the channel between each measurement. I am not certain how effective this will be. It take 200uS to re-enable the channel, plus any overhead for sending the command.

    I also need to note that the THS788 is not recommended for new designs.

    Regards,
    Wade
  • 0 in reply to Wade Vonbergen
    Prodigy 30 points
    Thanks Wade for the fast reply!
    Too bad it is not recommended for new designs.
    Does TI plan to build something else in the near future? Even one channel would work.
  • 0 in reply to Eric Bader32
    TI__Guru 62930 points
    Eric,
    Our group "High Reliability" only has the THS788/789 TMUs within it. We do not have plans for new TMUs.
    The Ultrasonic sensing team may have a roadmap device that could suit your needs.
    I would suggest posting to their forum with your design information to check for possible solutions.

    The THS788 will be available and shipping for foreseeable future. The NRND status is due to the lack of in depth design knowledge to support this device. The design team that created was disbanded several years ago. If you are comfortable with the device performance and usage, then there should not be a reason to move away from it. There is not a source of supply issue.

    Regards,
    Wade