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Ultrasonic signal reception

Amy Luo
Expert 6890 points
Other Parts Discussed in Thread: TDC1000, TUSS4440, TUSS4470, TDC1011

Hi team,

Is there a solution to replace the receiving part of TDC1000.

Customers want to receive ultrasonic signal, only need the signal processing function of TDC1000. TDC1000 includes transmission control and channel Select, which is not required by customers in design. Is there any other solution recommended to avoid function waste?

Best Regards,
Amy Luo

  • 0
    TI__Mastermind 27780 points

    Hi Amy,

    All of our ultrasonic ICs are currently both a driver+receiver combination. We have recently released the TUSS4470 and TUSS4440, which our the first ultrasonic ICs to showcase an integrated logarithmic amplifier at the front end. The log amp is a form of automatic gain control in this case that allows the sensor to detect a wide variety of small and large objects. You can read more about the benefits of the log amp in the Logarithmic Amplifier for Ultrasonic Sensor Signal Conditioning app report.

    You can compare the TUSS44x0 to the TDC1000 on the Ultrasonic E2E FAQ at: https://e2e.ti.com/support/sensors/f/1023/t/748143

    We do not have plans to release a receiver only IC for ultrasonic at this time.

  • 0 in reply to Akeem Whitehead
    TI__Expert 6890 points

    Hi Akeem,

    Thank you for your reply.

    Considering the package problem, my customer tends to choose TDC1011 as the receiver. At present, the frequency of ultrasonic is about 40KHZ-250KHZ. A band-pass filter that can modify the center frequency online is needed, with a bandwidth of about 100KHZ. Is there any scheme recommended? Is there any recommended configuration scheme for TDC1011 external two-stage filter?

    There is another question. If TUSS4440 is adopted, what is the delay between IN and OUT? Will it affect the accuracy of ultrasonic ranging?

    Best Regards,
    Amy Luo

  • 0 in reply to Amy Luo
    TI__Mastermind 27780 points

    Hi Amy,

    Responding to the TDC1011 question:

    To approximate the external band-pass filter component values, use the TDC1000 TINA-TI Reference Design to plot the AC Transfer Characteristics as a simulation to inspect the band-pass window. The TDC1000 datasheet's "8.3.5 Receiver Filters" section explains how to calculate and configure these external filter values also.

    Responding to the TUSS4440 question:

    The TUSS4440 is an analog output device, and there is no digital processing, so the output is nearly real-time. Delay between IN and OUT is negligible and will not affect the ranging accuracy. The TUSS4440's receiver can always be in the on/active mode to continuously monitor ultrasonic activity, unlike the TDC1000, which can only be turned on for a fixed amount of time.