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| 型號(hào)： | LM2893M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 通信及網(wǎng)絡(luò) |
| 英文描述： | LM1893/LM2893 Carrier-Current Transceiver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-20 |
| 文件頁(yè)數(shù)： | 1/24頁(yè) |
| 文件大小： | 576K |
| 代理商： | LM2893M |
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TL/H/6750
L
April 1995
LM1893/LM2893 Carrier-Current Transceiver
2
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.
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 carrierDcurrent 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 circuitDdangerous line voltage is present.
BI-LINE
TM
and COPS
TM
are trademarks of National Semiconductor Corp.
2
Carrier-Current Transceivers are also called Power Line Carrier (PLC) transceivers.
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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