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PGA460: operating frequency

Frederik Baars
Intellectual 2115 points
Part Number: PGA460

HI,

in the EVM http://www.ti.com/tool/BOOSTXL-PGA460#buy it says:

“Compatible with ultrasonic transducers operating at a center frequency between 30-80kHz and 180-480kHz.”

Is it only with this board that the operating frequency can only be adjusted in the higher frequencies?

We would need the frequencies from 35kHz - 450 kHz.

Thanks

Fred

  • 0
    TI__Mastermind 27950 points
    Hi Fred,

    The transducer switching frequency can be configured using the PGA460's FREQ_SHIFT bit. When FREQ_SHIFT=0, the device can be set between 30-80kHz, while FREQ_SHIFT=1 enables the 180-480kHz range. The FREQUENCY register specifically sets the switching frequency values based on the following equation:
    Frequency = 0.2 * FREQ + 30 [kHz]

    This allows you to use custom hardware for transducers within the 35-450kHz range. Keep in mind that the PGA460 does not support transducers in the frequency range of 81-179kHz. I still recommend that you use the PGA460-Q1 EVM and GUI to learn how to use and configure the device efficiently.