LTC1345ISW データシートの表示（PDF） - Linear Technology
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LTC1345ISW Datasheet PDF : 12 Pages
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LTC1345
APPLICATIONS INFORMATION
RS422/RS485 Applications
The receivers on the LTC1345 are ideal for RS422 and
RS485 applications. Using the test circuit in Figure 9, the
LTC1345 receivers are able to successfully reconstruct
the data stream with the common-mode voltage meeting
RS422 and RS485 requirements (12V to – 7V).
Figures 10 and 11 show that the LTC1345 receivers are
very capable of reconstructing data at rates up to 10Mbaud.
RECEIVER
OUTPUT
5V/DIV
RECEIVER
INPUT
5V/DIV
A
B
VCC1
5V
A
LTC485
B
GND
TTL
IN
100Ω
VCC2
5V
BX
TTL
OUT
100Ω LTC1345
AX
–+
12V TO – 7V
COMMON-MODE VOLTAGE
GND
LTC1345 • F09
RECEIVER
INPUT
B
A
5V/DIV
Figure 9 RS422/RS485 Receiver Interface
RECEIVER
OUTPUT
5V/DIV
5
0
0V
– 5V
– 10V
LTC1345 • F10
Figure 10. – 7V Common Mode
15V
10V
5V
0V
5
0
LTC1345 • F11
Figure 11. 12V Common Mode
10
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