DS2148T+ Maxim Integrated Products, DS2148T+ Datasheet - Page 48

• Manufacturer Part Number: DS2148T+
• Description: IC LIU E1/T1/J1 5V 44-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS2148T+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.4 G.703 Synchronization Signal
The DS2148 is capable of receiving a 2.048MHz square-wave synchronization clock as specified in
Section 13 of ITU G.703 (10/98). To use the DS2148 in this mode, set the receive synchronization clock
enable (CCR5.3) = 1. The DS2148 can also transmit the 2.048MHz square-wave synchronization clock as
specified in Section 10 of G.703. To transmit the 2.048MHz clock, set the transmit synchronization clock
enable (CCR5.2) = 1.
Table 7-1. Line Build-Out Select for E1 in Register CCR4 (ETS = 0)
N.M. = Not meaningful
Note: See
Table 7-2. Line Build-Out Select for T1 in Register CCR4 (ETS = 1)
N.M. = Not meaningful
Note: See
Table 7-3. Transformer Specifications for 5V Operation
Turns Ratio 5V Applications
Primary Inductance
Leakage Inductance
Interwinding Capacitance
Transmit Transformer DC Resistance
Receive Transformer DC Resistance
L2
L2
0
0
1
1
0
0
0
0
1
1
1
1
Primary (Device Side)
Secondary
Primary (Device Side)
Secondary
Figure
Figure
L1
L1
0
0
0
0
0
0
1
1
0
0
1
1
SPECIFICATION
7-1,
7-1,
Figure
Figure
L0
L0
0
1
0
1
0
1
0
1
0
1
0
1
7-2, and
7-2, and
V
V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
DD
DD
Figure
Figure
75Ω normal
120Ω normal
75Ω w/ high return loss
120Ω w/ high return loss
DSX-1 (0 to 133 feet) /
0dB CSU
DSX-1 (133 to 266 feet)
DSX-1 (266 to 399 feet)
DSX-1 (399 to 533 feet)
DSX-1 (533 to 655 feet)
-7.5dB CSU
-15dB CSU
-22.5dB CSU
7-3.
7-3..
APPLICATION
APPLICATION
1:1(receive) and 1:1.36(transmit) ±2%
600µH minimum
1.0µH maximum
40pF maximum
1.2Ω maximum
1.2Ω maximum
1.2Ω maximum
1.2Ω maximum
48 of 73
RECOMMENDED VALUE
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
1:1.36
N
N
RETURN LOSS
RETURN LOSS
N.M.
N.M.
21dB
21dB
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
18Ω
27Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
Rt
Rt