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LTC2858 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC2858
Description  짹60V Rugged PROFIBUS RS485 Transceivers
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2858 Datasheet(HTML) 11 Page - Linear Technology

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LTC2876/LTC2877
11
28767fa
For more information www.linear.com/LTC2876
TesT circuiTs
0
B´
A´
B´– A´
0
B´PP
VOD(PP)
A´PP
VBPP–APP = |B´PP – A´PP|
VBPP+APP = B´PP + A´PP
MEASUREMENTS TAKEN AT STEADY STATE
28767 F01
VCC
DI
RE
RO
DE
PA
PB
HIGH
HIGH
LTC2876/LTC2877
+–
390
390
220
RCABLE
RCABLE
B´
A´
VCC
390
390
220
VCC
PB
PA
CM
0
PB–PA
VOD(485)+
∆|VOC(485)|
VOD(485)–
MEASUREMENTS TAKEN AT STEADY STATE
FOR RS422 MEASUREMENTS, SUBSTITUTE 485 WITH 422 IN THIS FIGURE.
VOD(485) = PB–PA
∆|VOD(485)| = |VOD(485)+ – VOD(485)–|
28767 F02
VCC
DI
RE
RO
DE
PA
PB
HIGH
HIGH
LTC2876/LTC2877
+–
CM
VOD(485)
RL
RL
VOC(485)
Figure 1. Driver Differential Output Voltages for PROFIBUS Load
Figure 2. Driver Output Voltages in RS485 and RS422 Configurations
28767 F03
VCC
DI
RE
RO
DE
HIGH
HIGH OR LOW
HIGH
LTC2876/LTC2877
IOSD
PA
PB
+– –60VTO+60V
Figure 3. Drive Output Short-Circuit Current



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