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PGA450-Q1: Can the PGA450 be used in fixed Tx or Rx mode?

Frank Rothoff
Expert 6470 points
Part Number: PGA450-Q1

Hello team,

My customer likes the integration of the PGA450 however on system level they would like a number of fixed Tx (transmitter) and Rx (Recievers) for positioning and range reasons.

Could the PGA450 support that and how could this be arranged?

 Appreciate an answer before end of this week (Jan 27th).

  • 0
    TI__Mastermind 21685 points
    Frank,
    I am moving this to automotive forum where this device is supported.
    Thanks,
    Vishy
  • 0 in reply to Vishy Viswanathan
    TI__Mastermind 20590 points
    Hi Frank,

    I have assigned this to the appropriate applications engineer.

    Best Regards, Scott
  • 0
    TI__Mastermind 27950 points
    Hi Frank,

    Yes, the PGA450-Q1 can support the following:
    • Single transducer for both transmit and receive.
    • Single transducer for transmit only.
    • Single transducer for receive only.
    • Dual transducer for independent transmit and receive.

    To enable a transmit only mode, refer to the Functional Block Diagram (page 14) of the datasheet. Using the same external configuration, break the connection between the transducer to component Rs. This will prevent the ultrasonic activity from being recorded by the PGA450-Q1. (Note: Component Rs is a current limiting resistor to protect the AFE from becoming damaged due to the transformer's large driving voltage.)

    To enable an independent receiver only mode, tap onto the broken connection such that the receiving transducer's positive terminal connects to Rs (routing towards the AFE through component Cc), and the negative terminal connects to ground. For improved results, the receive only transducer can bypass component Rs, and connect directly to the coupling capacitor Cc and the LIM pin. Bypassing Rs is only recommended when the receive only transducer is known to resonate with a peak-to-peak swing of +/-1V.

    Typically, both the transmit and receive only modes are implemented on a single PGA450-Q1 to enable a bi-static configuration. This is especially helpful for applications that require short range measurement optimization (down to 5cm).