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I Compact AM-FM radios
I Battery operated tape player amplifiers
I Line driver
..
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LM2893M-LM2893N
LM1893/LM2893 Carrier-Current Transceiver
TL/H/6750
LM1893/LM2893
Carrier-Current
Transceiver
April 1995
LM1893/LM2893 Carrier-Current Transceiver²
General Description
Carrier-current systemsusethe power mainsto transferin-
formation between remote locations. This bipolar carrier-
current chip performsasa powerline interfacefor half-du-
plex (bi-directional) communicationof serialbit streamsof
virtuallyany coding.In transmission,a sinusoidal carrieris
FSKmodulatedand impressedon mostanypowerlineviaa
rugged on-chip driver.In reception,a PLL-based demodula-
torand impulse noise filtercombinetogive maximum range. complete system may consistofthe LM1893,a COPSTM
controller,and discrete components.
Features Noise resistant FSK modulation User-selected impulse noise filteringUpto4.8 kBaud data transmissionrate Stringsof0’sor1’sin data allowed Sinusoidalline driveforlowRFI Output power easily boosted 10-fold50to300kHz carrier frequency choice TTLand MOS compatible digital levels Regulated voltageto power logic Drivesall conventional power lines
Applications Energy management systems Home convenience control Inter-office communication Appliance control Fire alarm systems Security systems Telemetry Computer terminal interface
Typical Application
TL/H/6750–1
FIGURE1. Block diagram ofcarrierÐcurrent chipwitha complementof discrete components makinga complete
FOe125kHz, fDATAe360 Baudtransceiver.Use caution withthis circuitÐdangerousline voltage ispresent.
BI-LINETM andCOPSTMare trademarks ofNationalSemiconductorCorp.
²Carrier-CurrentTransceiversarealso calledPowerLineCarrier(PLC)transceivers.
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
