DS21348

Manufacturer Part NumberDS21348
Description3.3V E1/T1/J1 Line Interface
ManufacturerDallas Semiconducotr
DS21348 datasheet
 


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Page 48/73

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9.4
G.703 Synchronization Signal
The DS21348 is capable of receiving a 2.048MHz square-wave synchronization clock as specified in
section 10 of ITU G.703. In order to use the DS21348 in this mode, set the Receive Synchronization
Clock Enable (CCR5.3) = 1. The DS21348 can also transmit the 2.048MHz square-wave synchronization
clock as specified in section 10 of G.703. In order to transmit the 2.048 MHz clock, set the Transmit
Synchronization Clock Enable (CCR5.2) = 1.
LINE BUILD OUT SELECT FOR E1 IN REGISTER CCR4 (ETS = 0) Table 9-1
L2
L1
L0
V
DD
0
0
0
3.3V
0
0
1
3.3V
1
0
0
3.3V
1
0
1
3.3V
Note: See Figure 9-1, Figure 9-2, and Figure 9-3.
LINE BUILD OUT SELECT FOR T1 IN REGISTER CCR4 (ETS = 1) Table 9-2
L2
L1
L0
V
DD
0
0
0
3.3V
0
0
1
3.3V
0
1
0
3.3V
0
1
1
3.3V
1
0
0
3.3V
1
0
1
3.3V
1
1
0
3.3V
1
1
1
3.3V
Note: See Figure 9-1, Figure 9-2, and Figure 9-3.
TRANSFORMER SPECIFICATIONS FOR 3.3V OPERATION Table 9-3
SPECIFICATION
Turns Ratio 3.3V Applications
Primary Inductance
Leakage Inductance
Intertwining Capacitance
Transmit Transformer DC Resistance
Primary (Device Side)
Secondary
Receive Transformer DC Resistance
Primary (Device Side)
Secondary
APPLICATION
N
1:2
75W normal
1:2
120W normal
1:2
75W w/ high return loss
1:2
120W w/ high return loss
APPLICATION
N
DSX-1 (0 to 133 feet) /
1:2
0 DB CSU
DSX-1 (133 to 266 feet)
1:2
DSX-1 (266 to 399 feet)
1:2
DSX-1 (399 to 533 feet)
1:2
DSX-1 (533 to 655 feet)
1:2
-7.5dB CSU
1:2
-15dB CSU
1:2
-22.5dB CSU
1:2
RECOMMENDED VALUE
1:1 (receive) and 1:2 (transmit) ±2%
600mH minimum
1.0mH maximum
40pF maximum
1.0W maximum
2.0W maximum
1.2W maximum
1.2W maximum
48 of 73
RETURN LOSS
Rt
NM
0W
NM
0W
21dB
6.2W
21dB
11.6W
RETURN LOSS
Rt
NM
0W
NM
0W
NM
0W
NM
0W
NM
0W
NM
0W
NM
0W
NM
0W