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TDC1000: Texas Instruments's sensor interfacing circuit for a TDC1000

user4921711
Prodigy 10 points
Part Number: TDC1000

This Schemetic is from snia020(http://www.ti.com/lit/an/snia020/snia020.pdf ).

I wonder what's purpose of the 200Ω resistor?

  • 0
    TI__Mastermind 31655 points

    Hello,

    I was uncertain myself, so I tested it with and without the resistor in place, and no transducers connected. It limits the amplitude of the transmit signal, presumably to fall within the voltage rating of the switch that is used in the design. See the scope shots below:

    With 200ohm to ground:

     Without 200ohm to ground

    Regards,