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LM1893N Datasheet

  • LM1893N

  • LM1893/LM2893 Carrier-Current Transceiver

  • 24頁

  • NSC

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LM1893 LM2893 Carrier-Current Transceiver
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 COPS
TM
controller and discrete components
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
Applications
Y
Y
Y
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Noise resistant FSK modulation
User-selected impulse noise filtering
Up to 4 8 kBaud data transmission rate
Strings of 0鈥檚 or 1鈥檚 in data allowed
Sinusoidal line drive for low RFI
Energy management systems
Home convenience control
Inter-office communication
Appliance control
Fire alarm systems
Security systems
Telemetry
Computer terminal interface
Typical Application
TL H 6750 鈥?1
FIGURE 1 Block diagram of carrier current chip with a complement of discrete components making a complete
F
O
e
125 kHz f
DATA
e
360 Baud transceiver Use caution with this circuit dangerous line voltage is present
BI-LINE
TM
and COPS
TM
are trademarks of National Semiconductor Corp
Carrier-Current Transceivers are also called Power Line Carrier (PLC) transceivers
C
1995 National Semiconductor Corporation
TL H 6750
RRD-B30M115 Printed in U S A

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