LTC2846 Linear Technology, LTC2846 Datasheet - Page 12

• Manufacturer Part Number: LTC2846
• Description: 3.3V Software-Selectable Multiprotocol Transceiver with Termination
• Manufacturer: Linear Technology

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LTC2846
APPLICATIO S I FOR ATIO
When the cable is removed, leaving all mode pins uncon-
nected, the LTC2846/LTC2844 will enter no-cable mode.
In this mode the LTC2846/LTC2844 supply current drops
to less than 900 A and the LTC2846/LTC2844 driver out-
puts are forced into a high impedance state. At the same
time, the R2 and R3 receivers of the LTC2846 are differ-
entially terminated with 103 and the other receivers on
12
4
CONTROLLER
SERIAL
SCTE
DTR
DCD
DSR
RXD
RTS
TXD
RXC
CTS
TXC
LL
U
U
D4
D1
D2
D3
D2
D1
D3
LTC2844
R1
R2
R3
R4
R1
R2
R3
LTC2846
Figure 17. Complete Multiprotocol Interface in EIA530 Mode
DTE
W
103
103
103
U
RXD
SCTE
TXC
RXC
TXD
RTS
DTR
DCD
DSR
CTS
LL
the LTC2846 and LTC2844 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
LTC2846
DCE
LTC2844
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
2846 F17
sn2846 2846fs