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Número de pieza
componentes Descripción
LTM2881(RevA) Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LTM2881
(Rev.:RevA)
Complete Isolated RS485/RS422 µModule Transceiver + Power
Linear Technology
LTM2881 Datasheet PDF : 22 Pages
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LTM2881
TEST CIRCUITs
0V OR V
CC2
A
RO
RECEIVER
R
L
V
L
OR
B
V
CC2
OR 0V
RE
C
L
GND
2881 F07a
V
L
RE
0V
V
L
RO
V
OL
V
OH
RO
0V
1/2 V
L
t
ZLR
t
LZR
1/2 V
L
1/2 V
L
t
ZHR
t
HZR
Figure 7. Receiver Enable/Disable Time Measurements
0.5V
0.5V
2881 F07b
A
RO
RECEIVER
B
TE
I
A
R
TE
=
V
AB
I
A
+–
V
AB
+–
V
B
V
L
TE
0V
I
A
1/2 V
L
90%
t
RTEN
Figure 8. Termination Resistance and Timing Measurements
t
RTZ
10%
2881 F08
functional table
LOGIC INPUTS
MODE
A, B
ON
RE
TE DE
1
0
0
0
Receive
R
IN
1
0
0
1
Transceiver
R
IN
1
1
0
1
Transmit
R
IN
1
0
1
0 Receive + Term On
R
TE
0
X
X
X
Off
R
IN
Y, Z
Hi-Z
Driven
Driven
Hi-Z
Hi-Z
RO
Enabled
Enabled
Hi-Z
Enabled
Hi-Z
DC/DC
CONVERTER
On
On
On
On
Off
TERMINATOR
Off
Off
Off
On
Off
2881fa
11
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