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參數(shù)資料
| 型號： | LTC1545 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Software-Selectable Multiprotocol Transceiver(軟件-可選擇多協(xié)議5發(fā)5收收發(fā)器) |
| 中文描述： | 軟件選擇多協(xié)議收發(fā)器（軟件-可選擇多協(xié)議5發(fā)5收收發(fā)器） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 248K |
| 代理商： | LTC1545 |
11
LTC1545
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 16. Typical V.28 Interface
A
A
'
C
C
'
GENERATOR
BALANCED
INTERCONNECTING
CABLE
LOAD
CABLE
TERMINATION
RECEIVER
1545 F16
V.35 interface requires a T or delta network termination at
the receiver end and the generator end. The receiver
differential impedance measured at the connector must be
100
±
10
, and the impedance between shorted termi-
nals (A
'
and B
'
)
and ground C
'
must be 150
±
15
.
In V.35 mode, both switches S1 and S2 inside the LTC1344A
are on, connecting the T network impedance as shown in
Figure 19. Both switches in the LTC1543 are off. The 30k
input impedance of the receiver is placed in parallel with
the T network termination, but does not affect the overall
input impedance significantly.
The generator differential impedance must be 50
to
150
and the impedance between shorted terminals (A
and B) and ground C must be 150
±
15
. For the
generator termination, switches S1 and S2 are both on and
the top side of the center resistor is brought out to a pin so
it can be bypassed with an external capacitor to reduce
common mode noise as shown in Figure 20.
Figure 20. V.35 Driver Using the LTC1344A
V.35 DRIVER
A
B
C
51.5
S2
ON
S1
ON
1545 F20
51.5
LTC1344A
124
C1
100pF
R3
124
R5
20k
LTC1344A
LTC1543
RECEIVER
1545 F19
A
B
A
'
B
'
C
'
R1
51.5
R8
6k
S2
S3
R2
51.5
R6
10k
R7
10k
GND
R4
20k
S1
Figure 19. V.35 Receiver Configuration
V.35 Interface
A typical V.35 balanced interface is shown in Figure 18. A
V.35 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
Figure 18. Typical V.35 Interface
A
A
'
B
C
B
'
C
'
GENERATOR
BALANCED
INTERCONNECTING
CABLE
LOAD
CABLE
TERMINATION
RECEIVER
1545 F18
50
125
50
50
125
50
Figure 17. V.28 Receiver Configuration
R3
124
R5
20k
LTC1344A
LTC1543
LTC1545
RECEIVER
1545 F17
A
B
A
'
B
'
C
'
R1
51.5
R8
6k
S2
S3
R2
51.5
R6
10k
R7
10k
GND
R4
20k
S1
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