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Original question:

PGA460: Noisy waveform on EDD

PGA460: PGA460 question

Jimmy Huang22
Expert 1470 points
Part Number: PGA460

Hi TI team, 

     Could you pls help us give some advise for below question?thanks!

    The software has been configured. Aout of pga460, Bout has been equipped with high-frequency signal output, and the core probe is connected to the drive board, using the direct-driven sub-board. According to the manual, U7 has been removed

Hardware:

  • Sub-board schematic diagram:

software configuration

  • Output signal of PGA460 a-out foot:

It can be seen that only PGA460 sends out the pulse signal, and the core probe does not start to work.

The effect we need:

Aftershock signal + target signal:

  • 0
    TI__Mastermind 27950 points
    Hi Jimmy,

    The issue with your modified circuit is that you are attempting to use a mono-static (single sensor) full-bridge configuration, but the PGA460 EVM only supports a bi-static (two sensor) full-bridge configuration. You should use the EVM's original mono-static half-bridge configuration for a single sensor use-case.

    It is possible to enable a mono-static full-bridge configuration using additional external circuitry as described in the "PGA460 Full-Bridge Driver Solutions for Ultrasonic Transducers" app note ( www.ti.com/.../slaa780 ).