LTC2847 Linear Technology, LTC2847 Datasheet - Page 11

• Manufacturer Part Number: LTC2847
• Description: Software-Selectable Multiprotocol Transceiver
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
When the cable is removed, leaving all mode pins uncon-
nected, the LTC2847/LTC2845 will enter no-cable mode.
In this mode the LTC2847/LTC2845 supply current drops
to less than 1000 A and the LTC2847/LTC2845 driver
outputs are forced into a high impedance state. At the
same time, the R2 and R3 receivers of the LTC2847 are
differentially terminated with 103 and the other receiv-
4
CONTROLLER
SERIAL
SCTE
DTR
DCD
DSR
RXD
RTS
TXD
RXC
CTS
TXC
TM
RL
LL
RI
U
U
D4
D1
D2
D3
D2
D1
D3
LTC2845
R1
R2
R3
R4
R1
R2
R3
D5
LTC2847
Figure 17. Complete Multiprotocol Interface in EIA530 Mode
R5
DTE
W
103
103
103
U
RXD
SCTE
TXC
RXC
TXD
RTS
DTR
DCD
DSR
CTS
TM
RL
LL
RI
ers on the LTC2847 and LTC2845 are terminated with
30k to ground.
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
103
103
LTC2847
DCE
LTC2845
R5
D5
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
TM
RI
RL
CONTROLLER
LTC2847
SERIAL
2847 F17
sn2847 2847fs
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