LTC1544IG#PBF Linear Technology, LTC1544IG#PBF Datasheet - Page 11

• Manufacturer Part Number: LTC1544IG#PBF
• Description: IC TXRX SOFTWARE SELECTBL 28SSOP
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LTC1544IG#PBF

• Number Of Drivers/receivers: 4/4
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -

APPLICATIONS
V.11 (RS422) Interface
A typical V.11 balanced interface is shown in Figure 14. A
V.11 differential generator with outputs A and B with
ground C is connected to a differential receiver with
ground C
V.11 interface has a differential termination at the receiver
end that has a minimum value of 100 . 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 12.
In V.11 mode, all switches are off except S1 inside the
LTC1344A which connects a 103 differential termina-
tion impedance to the cable as shown in Figure 15.
B
C
A
'
'
'
GENERATOR
R1
51.5
S1
R2
51.5
'
, inputs A
S2
Figure 15. V.11 Receiver Configuration
LTC1344A
Figure 14. Typical V.11 Interface
A
B
C
124
R3
INTERCONNECTING
'
U
connected to A, B
BALANCED
CABLE
A
B
INFORMATION
U
GND
R8
6k
S3
A
B
C
TERMINATION
20k
20k
R5
'
'
R4
'
W
CABLE
'
connected to B. The
100
MIN
R6
10k
R7
10k
LOAD
RECEIVER
RECEIVER
U
LTC1543
LTC1544
1544 F14
1544 F15
V.28 (RS232) Interface
A typical V.28 unbalanced interface is shown in Figure 16.
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 C.
In V.28 mode all switches are off except S3 inside the
LTC1543/LTC1544 which connects a 6k (R8) impedance
to ground in parallel with 20k (R5) plus 10k (R6) for a
combined impedance of 5k as shown in Figure 17. The
noninverting input is disconnected inside the LTC1543/
LTC1544 receiver and connected to a TTL level reference
voltage for a 1.4V receiver trip point.
B
C
A
'
'
'
GENERATOR
R1
51.5
R2
51.5
S1
S2
Figure 17. V.28 Receiver Configuration
LTC1344A
Figure 16. Typical V.28 Interface
124
R3
C
A
INTERCONNECTING
BALANCED
CABLE
'
A
B
connected via the signal return
GND
R8
6k
S3
C
20k
A
20k
R5
R4
TERMINATION
'
'
CABLE
R6
10k
R7
10k
LTC1544
LOAD
RECEIVER
LTC1543
LTC1544
RECEIVER
11
1544 F16
'
con-
1544 F17