参数资料
型号: DS21Q348N
厂商: Maxim Integrated Products
文件页数: 47/76页
文件大小: 0K
描述: IC LIU T1/E1/J1 QUAD 3.3V 144BGA
标准包装: 90
类型: 线路接口装置(LIU)
规程: E1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 144-BBGA
供应商设备封装: 144-PBGA(17x17)
包装: 管件
DS21348/DS21Q348
51 of 76
7.4 G.703 Synchronization Signal
The DS21348 can receive a 2.048MHz square-wave synchronization clock as specified in Section 13 of
ITU G.703(10/98). 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. 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
(V)
APPLICATION
N
RETURN LOSS
(dB)
Rt (
)
0
3.3
75
normal
1:2
N.M.
0
1
3.3
120
normal
1:2
N.M.
0
1
0
3.3
75
with high return loss
1:2
21
6.2
1
0
1
3.3
120
with high return loss
1:2
21
11.6
Note: See Figure 7-1, Figure 7-2, and Figure 7-3. N.M. = Not meaningful.
Table 7-2. Line Build-Out Select for T1 in Register CCR4 (ETS = 1)
L2
L1
L0
VDD
(V)
APPLICATION
N
RETURN LOSS
(dB)
Rt (
)
0
3.3
DSX-1 (0 to 133 feet)/
0dB CSU
1:2
N.M.
0
1
3.3
DSX-1 (133 to 266 feet)
1:2
N.M.
0
1
0
3.3
DSX-1 (266 to 399 feet)
1:2
N.M.
0
1
3.3
DSX-1 (399 to 533 feet)
1:2
N.M.
0
1
0
3.3
DSX-1 (533 to 655 feet)
1:2
N.M.
0
1
0
1
3.3
-7.5dB CSU
1:2
N.M.
0
1
0
3.3
-15dB CSU
1:2
N.M.
0
1
3.3
-22.5dB CSU
1:2
N.M.
0
Note: See Figure 7-1, Figure 7-2, and Figure 7-3. N.M. = Not meaningful.
Table 7-3. Transformer Specifications for 3.3V Operation
SPECIFICATION
RECOMMENDED VALUE
Turns Ratio 3.3V Applications
1:1 (receive) and 1:2 (transmit) ±2%
Primary Inductance
600
H minimum
Leakage Inductance
1.0
H maximum
Intertwining Capacitance
40pF maximum
Transmit Transformer DC Resistance
Primary (Device Side)
Secondary
1.0
maximum
2.0
maximum
Receive Transformer DC Resistance
Primary (Device Side)
Secondary
1.2
maximum
1.2
maximum
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