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ManualsBrandsLINEAR TECHNOLOGY ManualsInterface ICsInterface IC - transceivers Multi protocol 2/2 QFN 28
31323334353637383940
LTC2870/LTC2871
36
28701fb
For more information www.linear.com/LTC2870
Typical applicaTions
Figure52. Quad Transceiver
DI-A
RO-A
TxAY-A
RxBZ-A
DI-B
RO-B
TxAY-B
RxBZ-B
DX485-A
TE485-A
RX232-A
RX485-A
DX232-A
DX485-B
TE485-B
RX232-B
RX485-B
DX232-B
DI-C
RO-C
TxAY-C
RxBZ-C
DX485-C
TE485-C
RX232-C
RX485-C
DX232-C
DI-D
RO-D
TxAY-D
RxBZ-D
DX485-D
TE485-D
RX232-D
RX485-D
DX232-D
V
CC
V
L
H/
F
CH
DX485
TE485
RX232
DIN1
DI
RX485
DIN2
DX232
ROUT1
RO
FEN
ROUT2
SW
CAP
V
DD
V
EE
GND
LB
DOUT1
Y
Z
RIN1
A
B
DOUT2
RIN2
L1
22µH
C1
470nF
C4
2.2µF
C2
2.2µF
C3
2.2µF
C5
2.2µF
V
CC
V
L
H/
F
CH
DX485
TE485
RX232
DIN1
DI
RX485
DIN2
DX232
ROUT1
RO
FEN
ROUT2
SW
CAP
V
DD
V
EE
GND
LB
DOUT1
Y
Z
RIN1
A
B
DOUT2
RIN2
V
CC
V
L
H/
F
CH
DX485
TE485
RX232
DIN1
DI
RX485
DIN2
DX232
ROUT1
RO
FEN
ROUT2
SW
CAP
V
DD
V
EE
GND
LB
DOUT1
Y
Z
RIN1
A
B
DOUT2
RIN2
V
CC
V
L
H/
F
CH
DX485
TE485
RX232
DIN1
DI
RX485
DIN2
DX232
ROUT1
RO
FEN
ROUT2
SW
CAP
V
DD
V
EE
GND
LB
DOUT1
Y
Z
RIN1
A
B
DOUT2
RIN2
C2
2.2µF
C3
2.2µF
LTC2871
LTC2871
LTC2871
LTC2871
28701 F51
Each channel supports half-duplex RS485 or full-duplex RS232. Up to four RS232 drivers can be
operated simultaneously using one inductor and flying cap as shown. I/O interface on left can be
simplified with additional logic gates as shown in Figure44
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