參數(shù)資料
型號: DS21Q48
廠商: Maxim Integrated Products
文件頁數(shù): 43/73頁
文件大?。?/td> 0K
描述: IC LIU E1/T1/J1 QUAD 5V 144-BGA
標(biāo)準(zhǔn)包裝: 90
類型: 線路接口裝置(LIU)
規(guī)程: E1
電源電壓: 4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 144-BBGA
供應(yīng)商設(shè)備封裝: 144-PBGA(17x17)
包裝: 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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