LM1893 Datasheet | National Semiconductor

Description Carrier-current systems use the power mains to transfer information between remote locations This bipolar carriercurrent chip performs as a power line interface for half-duplex (bi-directional) munication 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 demodulator and impulse noise filter bine to give maximum range A plete system may consist of the LM1893 a COPSTM controller and discrete ponents Y Y Y Y Y Output power easily boosted 10-fold 50 to 300 k Hz carrier frequency choice TTL and MOS patible digital levels Regulated voltage to power logic Drives all conventional power lines Applications Features Y Y Y Y Y Y Y Y Y Y Noise resistant FSK modulation User-selected impulse noise filtering Up to 4 8 k Baud data transmission rate Strings of 0’s or 1’s in data allowed Sinusoidal line drive for low RFI Energy management systems Home convenience control Inter-office munication Appliance control Fire alarm systems Security systems Telemetry puter terminal interface Typical Application TL H 6750 - 1 FIGURE 1 Block diagram of carrier current chip with a plement of discrete ponents making a plete FO e 125 k Hz f DATA e 360 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 Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply voltage Voltage on pin 12 Voltage on pin 10 (Note 1) Voltage on pins 5 and 17 5 6 V DC zener current Junction temperature transmit mode receive mode Electro-Static Discharge (120 p F 1500X) 30 V 55...