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National Semiconductor - LM1893/LM2893 Carrier-Current Transceiver

Numéro de référence LM2893M
Description LM1893/LM2893 Carrier-Current Transceiver
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM2893M fiche technique
April 1995
LM1893 LM2893 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
A complete system may consist of the LM1893 a COPSTM
controller and discrete components
Features
Y Noise resistant FSK modulation
Y User-selected impulse noise filtering
Y Up to 4 8 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
TL H 6750 – 1
FIGURE 1 Block diagram of carrier current chip with a complement of discrete components making a complete
FOe125 kHz fDATAe360 Baud transceiver Use caution with this circuit dangerous line voltage is present
BI-LINETM and COPSTM are trademarks of National Semiconductor Corp
Carrier-Current Transceivers are also called Power Line Carrier (PLC) transceivers
C1995 National Semiconductor Corporation TL H 6750
RRD-B30M115 Printed in U S A

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