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PGA460

user4547263
Prodigy 10 points
Part Number: PGA460
Other Parts Discussed in Thread: TDC1000

Hello, team

We are planning on using PGA460 in conjuction with a 140 kHz closed type transducer. But from the datasheet, we are observed that the PGA460 only can emmit the 30K-80KHz or 180kHz - 480kHz Burst .

and we also observed that in the page 12, item 7.3.2 gives two equition 1: F(DRV) = 0.2 * f  + 30 kHz, and equition 2: n= F(CORE_CLK)/F(DRV), and it said that "The actual driving frequency of the output stage is

derived from the core clock frequency using Equation 1 and Equation 2" .here my question is what is the Equation 2 means, if we can change the n in the Equation 2,  so we can let the PGA460 emmit the

140kHz Burst?

my another question is, if PGA460 can't emmit 140kHz Burst, is there another solution, or some suggestion?

Thank you very much,

Eric

  • 0
    TI__Genius 11015 points

    Eric,

    We have received your question & will answer it before Wednesday.

  • 0
    TI__Mastermind 27950 points

    Hi Eric,

    Unfortunately, you will not be able to "burst-and-listen" evaluate the 140kHz transducer using the PGA460. The core frequency is factory calibrated to 16MHz, and cannot be adjusted by the end user. One workaround: you can use the PGA460 in listen only mode to center the receiver's DSP coefficients at 140kHz, but you will need an external driver to burst/excite the transducer. You would need to synchronize the external driving of the transducer with the listen only start time to successfully capture the burst and listen activity. The PGA460's limitation between 81-179kHz is its inability to drive, but is still able to listen anywhere between 30-480kHz.

    You can consider using an alternative device, the TDC1000, given this device will support a 140kHz transducer. However, the maximum supported detectable range through air of this device will be limited to about 1.2m due to its 8.192ms record timer. Also, you will need to use the TDC1000 in a pre-driver mode to generate sufficient SPL since you are using a closed-top transducer.

    Bharat will be able to answer any additional questions you have about the TDC1000.