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LM1812

National Semiconductor
Part Number LM1812
Manufacturer National Semiconductor
Description ULTRASONIC TRANSCEIVER
Published Mar 22, 2005
Detailed Description LM1812 Ultrasonic Transceiver April 1989 LM1812 Ultrasonic Transceiver General Description The LM1812 is a general pu...
Datasheet PDF File LM1812 PDF File

LM1812
LM1812

Overview
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 driven disc Connections to the neon are made through brushes and slip rings Rotating with and counterbalancing the neon lamp is a permanent magnet whose field induces a pulse in a stationary coil (L8) as it passes by This pulse keys the LM1812’s transmitter Available from Toko America 1250 Feehanville Drive Mount Prospect Illinois 60056 Tel (312) 297-0070 Available from Massa Products Corporation 280 Lincoln Street Hingham Massachusetts 02043 Tel (617) 749-4800 FIGURE 1 200 kHz Depth Sounder 5 ...


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