LTC1545IG#TR Linear Technology, LTC1545IG#TR Datasheet - Page 11

• Manufacturer Part Number: LTC1545IG#TR
• Description: IC TXRX SOFTWARE SELECTBL 36SSOP
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LTC1545IG#TR

• Number Of Drivers/receivers: 5/5
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Protocol: -

APPLICATIONS
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
B
C
A
'
'
'
GENERATOR
GENERATOR
50
50
R1
51.5
R2
51.5
S1
'
, inputs A
S2
Figure 17. V.28 Receiver Configuration
125
LTC1344A
Figure 16. Typical V.28 Interface
Figure 18. Typical V.35 Interface
124
R3
C
A
INTERCONNECTING
A
B
C
'
U
connected to A, B
INTERCONNECTING
BALANCED
CABLE
BALANCED
CABLE
A
B
INFORMATION
U
GND
R8
6k
S3
C
A
20k
20k
R4
TERMINATION
R5
'
'
C
B
A
'
'
W
'
CABLE
TERMINATION
'
connected to B. The
125
CABLE
R6
10k
R7
10k
LOAD
LOAD
50
50
RECEIVER
U
RECEIVER
LTC1543
LTC1545
RECEIVER
1545 F16
1545 F17
1545 F18
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
nals (A
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
150 and the impedance between shorted terminals (A
and B) and ground C must be 150
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.
B
C
A
'
'
'
'
10 , and the impedance between shorted termi-
R1
51.5
S1
R2
51.5
and B
S2
V.35 DRIVER
Figure 20. V.35 Driver Using the LTC1344A
Figure 19. V.35 Receiver Configuration
LTC1344A
124
'
R3
) and ground C
LTC1344A
A
B
124
GND
R8
6k
S3
'
must be 150
20k
20k
R4
R5
C1
100pF
ON
S2
R6
10k
R7
10k
S1
ON
51.5
51.5
LTC1545
15 . For the
RECEIVER
LTC1543
1545 F20
15 .
A
B
C
11
1545 F19
to