參數(shù)資料
型號(hào): DS21Q48N
廠商: Maxim Integrated Products
文件頁數(shù): 47/73頁
文件大?。?/td> 0K
描述: IC LIU E1/T1/J1 4X 5V LONG144BGA
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
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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