Datasheet

LTC2870/LTC2871
11
28701f
BLOCK DIAGRAM
LTC2870
2870 BD
CONTROL
LOGIC
DRIVERS
RECEIVERS
LOOPBACK
PATH
0.1µF
DXEN
RXEN
TE485
H/F
485/232
FEN
LB
DY
DZ
RA
RB
GND
B
A
Z
Y
V
EE
V
DD
1.7V TO 5.5V
(≤ V
CC
)
PULSE-SKIPPING
BOOST
REGULATOR
f = 1.2MHz
RT232
RT485
2.2µF
10µH
220nF
3V TO 5.5V
1µF
1µF
CAPSWV
CC
V
L
232
485
232
232
485
232
5k
RT232
RT485
125k
5k
125k
125k
120
RT485
120
H/F
125k