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LTM2885 Datasheet(PDF) 12 Page - Linear Technology

Part # LTM2885
Description  6500VRMS Isolated RS485/RS422 關Module Transceiver Power
PDF  22 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTM2885 Datasheet(HTML) 12 Page - Linear Technology

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LTM2885
12
2885fa
For more information www.linear.com/LTM2885
TEST CIRCUITS
A
B
0V OR VCC2
VCC2 OR 0V
RO
RE
CL
RL
VL
OR
GND
2885 F07a
RECEIVER
tZLR
tZHR
tHZR
tLZR
1/2 VL
1/2 VL
1/2 VL
RE
RO
RO
VL
VL
VOL
VOH
0V
0V
0.5V
0.5V
2885 F07b
Figure 7. Receiver Enable/Disable Time Measurements
tRTEN
tRTZ
VL
B
A
IA
TE
2885 F08
RECEIVER
90%
10%
0V
TE
+–
+–
VAB
VB
RTE =
IA
VAB
1/2 VL
RO
IA
Figure 8. Termination Resistance and Timing Measurements
FUNCTIONAL TABLE
LOGIC INPUTS
MODE
A, B
Y, Z
RO
DC/DC
CONVERTER
TERMINATOR
ON
RE
TE
DE
1
0
0
0
Receive
RIN
Hi-Z
Enabled
On
Off
1
0
0
1
Transceive
Driven
1
0
1
0
Receive + Term On
RTE
Hi-Z
On
1
0
1
1
Transceive + Term On
Driven
1
1
0
0
Power On
RIN
Hi-Z
Hi-Z
Off
1
1
0
1
Transmit
Driven
1
1
1
0
Term On
RTE
Hi-Z
On
1
1
1
1
Transmit + Term On
Driven
0
X
X
X
Off
RIN
Hi-Z
Off
Off



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