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
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
One or two-transducer operation
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