Device for transmitting information has galvanic isolation

The invention relates to a device for transmitting information in electrical isolation, comprising coding means (80) said information in a multi-frequency signal (f, f); a first ultrasonic transducer array (E) vibrating membrane, formed on a first face of a wafer, adapted to convert said signal into an acoustic signal multifrequency propagating in said wafer; and a second ultrasonic transducer array (R) formed on a second face of said wafer, the second network comprising at least two sets of ultrasonic transducer vibrating membrane whose resonant frequencies are equal to two distinct frequencies (f, f) DTMF signal.