TLH6750

April 1995

LM1893LM2893 Carrier-Current Transceiver

General Description

Carrier-current systems use the power mains to transfer in-

formation between remote locations This bipolar carrier-

current chip performs as a power line interface for half-du-

plex (bi-directional) communication of serial bit streams of

virtually any coding In transmission a sinusoidal carrier is

FSK modulated and impressed on most any power line via a

rugged on-chip driver In reception a PLL-based demodula-

tor and impulse noise filter combine to give maximum range

controller and discrete components

Features

Y

Noise resistant FSK modulation

Y

User-selected impulse noise filtering

Y

Up to 48 kBaud data transmission rate

Y

Strings of 0’s or 1’s in data allowed

Y

Sinusoidal line drive for low RFI

Y

Output power easily boosted 10-fold

Y

50 to 300 kHz carrier frequency choice

Y

TTL and MOS compatible digital levels

Y

Regulated voltage to power logic

Y

Drives all conventional power lines

Applications

Y

Energy management systems

Y

Home convenience control

Y

Inter-office communication

Y

Appliance control

Y

Fire alarm systems

Y

Security systems

Y

Telemetry

Y

Computer terminal interface

Typical Application

TLH6750 – 1

FIGURE 1 Block diagram of carriercurrent chip with a complement of discrete components making a complete

Carrier-Current Transceivers are also called Power Line Carrier (PLC) transceivers

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A