LTC2873H Просмотр технического описания (PDF) - Analog Devices
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LTC2873H Datasheet PDF : 32 Pages
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LTC2873
TEST CIRCUITS
A/DO
GND
OR
DI
DRIVER
+
RL
VOD
VL
–
B/RI
RL +
VOC
–
2873 F01
Figure 1. RS485 Driver DC Characteristics
A/DO OR
B/RI
GND
OR
DI
DRIVER
VL
B/RI
OR A/DO
IOSD485
+– VOUT
2873 F02
Figure 2. RS485 Driver Output Current
IIN485 A/DO OR
B/RI
+– VIN
B/RI RECEIVER
OR A/DO
RIN485 =
VIN
IIN485
2873 F03
Figure 3. RS485 Receiver Input Current and Resistance
A/DO
DI
DRIVER
CL
RDIFF
B/RI
CL
DI
tPLHD485
B/RI
VOD
A/DO
tSKEWD485
½VOD
A/RO – B/DI
90%
10%
0V
tRD485
Figure 4. RS485 Driver Timing Measurement
VL
tPHLD485
0V
90%
0V
10%
tFD485
2873 F04
REV B
12
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