Ultrasonic sonar ranging ic prowave pw0268 this ultrasonic sonar ranging ic is designed for echo ranging systems design features that enhance the performance and useage of this device include an externally tunable rc oscillator that can automatically track and compensate for shifts in transducer resonant frequency due to temperature fluctuations a fixed gain preamplifier that can compensate for varying transducer sensitivities a 32 step time controlled variable gain amplifier that can hav