LTC1543C View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1543C Datasheet PDF : 20 Pages
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APPLICATIONS INFORMATION
IZ
3.25mA
–10V
–3V
3V
VZ
10V
–3.25mA
1543 F13
Figure 13. V.10 Receiver Input Impedance
LTC1543
A'
A
R5
R8
6k
20k
S3
LTC1544
R6
10k
RECEIVER
B'
B
R4
20k
R7
10k
C'
GND
1543 F14
Figure 14. V.10 Receiver Configuration
V.11 (RS422) Interface
A typical V.11 balanced interface is shown in Figure 15. A
V.11 differential generator with outputs A and B with
ground C is connected to a differential receiver with
ground C', inputs A' connected to A, B' connected to B. The
V.11 interface has a differential termination at the receiver
end that has a minimum value of 100Ω. The termination
resistor is optional in the V.11 specification, but for the
high speed clock and data lines, the termination is required
to prevent reflections from corrupting the data. The
receiver inputs must also be compliant with the imped-
ance curve shown in Figure 13.
In V.11 mode, all switches are off except S1 inside the
LTC1344A which connects a 103Ω differential termina-
tion impedance to the cable as shown in Figure 16.
GENERATOR
BALANCED
INTERCONNECTING
CABLE
LOAD
CABLE
TERMINATION
RECEIVER
A
A'
100Ω
MIN
B
B'
C
C'
1543 F15
Figure 15. Typical V.11 Interface
A'
A
R1 LTC1344A
51.5Ω
R8
6k
R5
20k
S1
R3
S3
S2 124Ω
R2
51.5Ω
B'
C'
R4
B
20k
GND
LTC1543
LTC1544
R6
10k
RECEIVER
R7
10k
1543 F16
Figure 16. V.11 Receiver Configuration
11
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