参数资料
型号: DS2148T
厂商: Maxim Integrated Products
文件页数: 43/73页
文件大小: 0K
描述: IC LIU E1/T1/J1 5V 44-TQFP
产品培训模块: Lead (SnPb) Finish for COTS
产品变化通告: Product Discontinuation 20/Feb/2012
标准包装: 160
类型: 线路接口装置(LIU)
驱动器/接收器数: 1/1
规程: T1/E1/J1
电源电压: 4.75 V ~ 5.25 V
安装类型: 表面贴装
封装/外壳: 44-TQFP
供应商设备封装: 44-TQFP(10x10)
包装: 管件
DS2148/DS21Q48
48 of 73
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)
L2
L1
L0
VDD
APPLICATION
N
RETURN LOSS
Rt
0
5V
75
normal
1:1.36
N.M.
0
0
1
5V
120
normal
1:1.36
N.M.
0
1
0
5V
75
w/ high return loss
1:1.36
21dB
18
1
0
1
5V
120
w/ high return loss
1:1.36
21dB
27
N.M. = Not meaningful
Table 7-2. Line Build-Out Select for T1 in Register CCR4 (ETS = 1)
L2
L1
L0
VDD
APPLICATION
N
RETURN LOSS
Rt
0
5V
DSX-1 (0 to 133 feet) /
0dB CSU
1:1.36
N.M.
0
0
1
5V
DSX-1 (133 to 266 feet)
1:1.36
N.M.
0
0
1
0
5V
DSX-1 (266 to 399 feet)
1:1.36
N.M.
0
0
1
5V
DSX-1 (399 to 533 feet)
1:1.36
N.M.
0
1
0
5V
DSX-1 (533 to 655 feet)
1:1.36
N.M.
0
1
0
1
5V
-7.5dB CSU
1:1.36
N.M.
0
1
0
5V
-15dB CSU
1:1.36
N.M.
0
1
5V
-22.5dB CSU
1:1.36
N.M.
0
N.M. = Not meaningful
Table 7-3. Transformer Specifications for 5V Operation
SPECIFICATION
RECOMMENDED VALUE
Turns Ratio 5V Applications
1:1(receive) and 1:1.36(transmit) ±2%
Primary Inductance
600
H minimum
Leakage Inductance
1.0
H maximum
Interwinding Capacitance
40pF maximum
Transmit Transformer DC Resistance
Primary (Device Side)
Secondary
1.2
maximum
1.2
maximum
Receive Transformer DC Resistance
Primary (Device Side)
Secondary
1.2
maximum
1.2
maximum
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