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TDC1000: External Crystal Accuracy requirements

XINGQIU FU
Prodigy 20 points
Part Number: TDC1000
Other Parts Discussed in Thread: TUSS4470, , TUSS4440

ASEMB-8.000MHZ-LY-T is implemented in TDC1000-C2000EVM, which is from Abracon. My question is what the detailed requirements for the external crystal. Are there other alternative crystals for this application? Thanks.

  • 0
    TI__Mastermind 27950 points

    Xingqiu,

    As long as your external crystal oscillator frequency does not exceed 16MHz, and the voltage at the CLKIN pin does not exceed VIO+0.3V, you can use nearly any external oscillator source. We do not have any alternative part numbers to recommend at this time, as there are several alternatives that you should select from based on your transducer's operating frequency and the clock divisor value you prefer to use.

    Note, we have released a new family of ultrasonic devices supporting up to 1MHz transducer operation: the TUSS4440 and TUSS4470, which are intended to displace the TDC1000 due to improved performance and integrated features. We recommend using these TUSS44x0 devices instead of the TDC1000 moving forward.

  • 0 in reply to Akeem Whitehead
    Prodigy 20 points

    Thanks Akeem Whitehead. What is the better performance of TUSS4440 and TUSS4470, compared to TDC1000? I saw the price of TUSS44X0 is expensive than TDC1000.

  • 0 in reply to XINGQIU FU
    TI__Mastermind 27950 points

    Hi Xingqiu,

    The primary advantage of the TUSS44x0 is its integrated logarithm amplifier at the receiver. You can think of this feature as an automated front end gain control to maximize the SNR for any object at any distance while keeping the noise floor at a fixed level. This is how the TUSS44x0 creates a wide-band dynamic range up to 86dB, while the TDC1000 only offers a single level programmable gain up to 21dB.

    The integrated log amp is why the TUSS price is higher, but also why the TUSS offers improved performance.