参数资料
型号: DS21Q48A3N
厂商: Maxim Integrated Products
文件页数: 47/73页
文件大小: 0K
描述: IC LIU 5V E1/T1/J1 144-BGA
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1
类型: 线路接口装置(LIU)
规程: E1
电源电压: 4.75 V ~ 5.25 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
DS2148/DS21Q48
51 of 73
Figure 7-3. Protected Interface Using External Receive Termination
NOTES:
1) All resistor values are ±1%.
2) C1 = 0.1F.
3) S is a 6V transient suppresser.
4) D1 to D4 are Schottky diodes.
5) The fuses are optional to prevent AC power line crosses from compromising the transformers.
6) Rp resistors exist to keep the Fuses from opening during a surge. If they are used, then Rr must be adjusted to match the line
impedance.
7) Rr = 37.5
for 75, 60 for 120 E1 systems, or 50 for 100 T1 lines.
8) The Rt resistors are used to increase the transmitter return loss (Table 7-1). No return loss is required for T1 applications.
9) The transmit transformer turns ratio (N) would be 1:1.36 for 5V operation.
10) The 68
F is used to keep the local power plane potential within tolerance during a surge.
RTIP
RRING
TTIP
TRING
Receive
Line
N:1
(larger winding
toward the network)
DS2148
0.47F
(non-
polarized)
VDD (21)
VSS (22)
VDD (36)
VSS (35)
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
MCLK
+VDD
S
C1
D1
D2
D3
D4
1:1
0.1F
470
Rp
Fuse
Rp
Fuse
Rr
Rt
(optional)
Transmit
Line
Rp
Fuse
Rp
Fuse
(optional)
0.1F
+VDD
0.01F
68F
10F
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