The TUSS4470 device must be paired with an external ultrasonic transducer. The TUSS4470 device drives the transducer to generate an ultrasonic echo and applies logarithmic gain scaling to the received echo signal in the analog front end. The transducer should be chosen based on the resonant frequency, input voltage requirements, sensitivity, beam pattern, and decay time. The TUSS4470 device is flexible enough to meet most transducer requirements by adjusting the driving frequency, driving current limit, and center frequency of the band-pass filter. The only available interface to configure the device registers is SPI. During the burst-and-listen cycles, an external ADC or analog receiver should be used to capture the echo envelope from the VOUT pin to compute time of flight (ToF), distance, amplitude, and/or width of the return echo.