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purpose of TDC7200

Khai Lee
Prodigy 180 points
Other Parts Discussed in Thread: TDC7200

Hi,

What is the purpose of TDC7200.

I think MCU can be enough to calculate flight duration time.

even if I use TDC7200, it seems that I need another MCU followed by TDC7200.

  • 0
    TI__Intellectual 1635 points
    Hi Khai,
    It depends on your application. If your application requires nano-second accuracy, then the MCU is good enough. However, if your application requires pico-second acuracy, like in the case for flow meter applications, then we recommend using the TDC7200, whose accuracy is in the ~50 pico-secod range that most MCU cannot achieve. I hope that helps.
  • 0 in reply to AmyLe
    Prodigy 10 points
    Hi,

    What if I need to measure ultralow flow rate whose delta TOF in femto-second range? Can I use higher rate clock to achieve measurement?

    Dave
  • 0 in reply to Dave Pooh
    TI__Mastermind 21685 points
    Hello Dave,

    TDC7200 Mode 2 measurement range minimum is 2 clock cycles. Maximum input clock freq for TDC7200 is 16MHz. That calculates to 125ns.
    In Mode 1 TDC7200 measurement range minimum is 12ns.
    Please refer to TDC7200 Data Sheet page 5.

    Thanks,
    Vishy