LTC1344AIG Linear Technology, LTC1344AIG Datasheet - Page 7

• Manufacturer Part Number: LTC1344AIG
• Description: IC TERMINATOR CABLE MULTI 24SSOP
• Manufacturer: Linear Technology
• Type: Cabler

Specifications of LTC1344AIG

• Number Of Terminations: 6
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
V.28 (RS232) Termination
A typical V.28 unbalanced interface is shown in Figure 8.
A V.28 single-ended generator output A with ground C is
connected to a single-ended receiver with input A
nected to A, ground C
ground to C. The V.28 standard requires a 5k terminating
resistor to ground which is included in almost all compli-
ant receivers as shown in Figure 9. Because the termina-
tion is included in the receiver, both switches S1 and S2 in
the LTC1344A are turned off.
Z
GENERATOR
Figure 7. V.11 Interface Using the LTC1344A
A
B
C
– 3.25mA
ON
S1
Figure 6. Typical V.11 Interface
51.5
51.5
–10V
INTERCONNECTING
U
A
B
C
OFF
S2
BALANCED
CABLE
'
LTC1344A
124
INFORMATION
connected via the signal return
U
–3V
A
B
C
'
'
'
I
Z
TERMINATION
W
CABLE
3V
Z
Z
100
MIN
LOAD
RECEIVER
V.11
RECEIVER
10V
3.25mA
V
1344 F06
U
Z
1344 F07
'
con-
V.35 Termination
A typical V.35 balanced interface is shown in Figure 10. A
V.35 differential generator with outputs A and B with
ground C is connected to a differential receiver with
ground C
V.35 interface requires a T-network termination at the
receiver end and the generator end. In V.35 mode both
switches S1 and S2 in the LTC1344A are turned on as
shown in Figure 11.
The differential impedance measured at the connector
must be 100
terminals A
input impedance of the V.35 receiver is connected in
parallel with the T-network inside the LTC1344A, which
could cause the overall impedance to fail the specification
GENERATOR
Figure 9. V.28 Interface Using the LTC1344A
'
A
B
C
, inputs A
'
OFF
and B
S1
Figure 8. Typical V.28 Interface
51.5
51.5
10 and the impedance between shorted
'
OFF
'
S2
to ground C
INTERCONNECTING
connected to A, B
A
C
BALANCED
LTC1344A
CABLE
124
'
A
C
'
'
must be 150
TERMINATION
CABLE
'
1344 F09
5k
connected to B. The
LTC1344A
RECEIVER
LOAD
V.28
RECEIVER
1344 F08
15 . The
7