LTC1546 Linear Technology, LTC1546 Datasheet - Page 10

• Manufacturer Part Number: LTC1546
• Description: Software-Selectable Multiprotocol Transceiver with Termination
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
LTC1546
Cable Termination
Traditional implementations used expensive relays to
switch resistors or required the user to change termina-
tion modules every time a new interface standard was
selected. Switching the terminations with FETs is difficult
because the FETs must remain off when the signal voltage
is beyond the supply voltage. Alternatively, custom cables
10
CONTROLLER
SERIAL
SCTE
DTR
DCD
DSR
RXC
RXD
RTS
CTS
TXD
TXC
LL
U
U
D4
D1
D2
D3
D1
D2
D3
LTC1544
R1
R2
R3
R4
R1
R2
R3
LTC1546
Figure 17. Complete Multiprotocol Interface in EIA530 Mode
DTE
W
103
103
103
U
SCTE
RXC
RXD
TXC
TXD
DCD
DSR
RTS
DTR
CTS
LL
may contain termination in the cable head or route signals
to various terminations on the board.
The LTC1546/LTC1544 chipset solves the cable termina-
tion switching problem by automatically providing the
appropriate termination and switching on-chip for the
V.10 (RS423), V.11 (RS422), V.28 (RS232) and V.35
electrical protocols.
103
103
LTC1546
DCE
LTC1544
R4
R2
R3
R1
R3
R2
R1
D3
D2
D1
D3
D2
D1
D4
TXD
SCTE
TXC
RXC
RXD
RTS
DTR
DCD
DSR
CTS
LL
CONTROLLER
SERIAL
1546 F17