LM1893 National Semiconductor, LM1893 Datasheet
LM1893
Manufacturer Part Number
LM1893
Description
LM1893/LM2893 Carrier-Current Transceiver
Manufacturer
National Semiconductor
Datasheet
1.LM1893.pdf
(24 pages)
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C 1995 National Semiconductor Corporation
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 COPS
controller and discrete components
Features
Y
Y
Y
Y
Y
Typical Application
BI-LINE
Carrier-Current Transceivers are also called Power Line Carrier (PLC) transceivers
FIGURE 1 Block diagram of carrier current chip with a complement of discrete components making a complete
Noise resistant FSK modulation
User-selected impulse noise filtering
Up to 4 8 kBaud data transmission rate
Strings of 0’s or 1’s in data allowed
Sinusoidal line drive for low RFI
F
TM
O
e
and COPS
125 kHz f
TM
are trademarks of National Semiconductor Corp
DATA
e
360 Baud transceiver Use caution with this circuit dangerous line voltage is present
TL H 6750
TM
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Y
Y
Y
Y
Output power easily boosted 10-fold
50 to 300 kHz carrier frequency choice
TTL and MOS compatible digital levels
Regulated voltage to power logic
Drives all conventional power lines
Energy management systems
Home convenience control
Inter-office communication
Appliance control
Fire alarm systems
Security systems
Telemetry
Computer terminal interface
RRD-B30M115 Printed in U S A
TL H 6750 – 1
April 1995
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