LM1812

LM1812 Ultrasonic Transceiver April 1989 LM1812 Ultrasonic Transceiver General Description The LM1812 is a general purpose ultrasonic transceiver designed for use in a variety of ranging sensing and communications applications The chip contains a pulse-modulated class C transmitter a high gain receiver a pulse modulation detector and noise rejection circuitry A single LC network defines the operating frequency for both the transmitter and receiver The class C transmitter output drives up to 1A (12W) peak at frequencies up to 325 kHz The externally programmed receiver gain provides a detection sensitivity of 200 mVp-p Detection circuitry included on-chip is capable of rejecting impulse noise with external programming The detector output sinks up to 1A Applications include sonar systems non-contact ranging and acoustical data links in both liquid and gas ambients Features Y One or two-transducer operation Y Transducers interchangeable without realignment Y No external transistors Y Impulse noise rejection Y No heat sinking Y Protection circuitry included Y Detector output drives 1A peak load Y Ranges in excess of 100 feet in water 20 feet in air Y 12W peak transmit power Applications Y Liquid level measurement Y Sonar Y Surface profiling Y Data links Y Hydroacoustic communications Y Non-contact sensing Y Industrial process control Typical Application Order Number LM1812N See NS Package Number N18A TL H 7892 – 1 Note Echo returns are displayed by a neon lamp on a motor d...