LTM2881_15 Datasheet, PDF (10/24 Pages) Linear Technology – Complete Isolated RS485/RS422 Module Transceiver Power

LTM2881
Block Diagram
V_CC
2.2µF
V_L
2.2µF
ISOLATED
DC/DC
CONVERTER
RO
RE
DE
DI
ON
TE
D_OUT
ISOLATED
COMM
INTERFACE
GND
= LOGIC SIDE COMMON
V_CC2
5V
REG
2.2µF
RX
ISOLATED
COMM
INTERFACE
DX
A
B
120Ω
Y
Z
SLO
D_IN
GND2
= ISOLATED SIDE COMMON
2881 BD
TEST CIRCUITs
Y
GND _DI
+
OR
V_L
DRIVER
V_–OD
Z
R
R₊
V_–OC
2881 F01
Figure 1. Driver DC Characteristics
Y
GND _DI
OR
DRIVER
V_L
Z
I_OSD
+
–
–7V TO 12V
2881 F02
Figure 2. Driver Output Short-Circuit Current
I_IN
A OR B
V_IN ^+–
RECEIVER
B OR A
R_IN
=
V_IN
I_IN
2881 F03
Figure 3. Receiver Input Current and Input Resistance
10
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2881fh