參數(shù)資料
型號(hào): DS2148
英文描述: 5V E1/T1/J1 Line Interface
中文描述: 5V、E1/T1/J1線路接口
文件頁(yè)數(shù): 53/75頁(yè)
文件大小: 544K
代理商: DS2148
DS2148/Q48
53 of 75
PROTECTED INTERFACE USING EXTERNAL RECEIVE TERMINATION
Figure 9-3
NOTES:
1) All resistor values are ±1%.
2) C1 = 0.1μF.
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 9-1). 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
0.47μF
(non-
polarized)
V
DD
(21)
V
SS
(22)
V
DD
(36)
V
SS
(35)
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
MCLK
+V
DD
S
C1
D1
D2
D3
D4
1:1
0.1μF
470
470
Rp
Fuse
Rp
Fuse
(optional)
Rr
Rr
Rt
Rt
Transmit
Line
Rp
Fuse
Rp
Fuse
(optional)
0.1μF
0.1μF
+V
DD
0.01μF
68μF
10μF
10μF
相關(guān)PDF資料
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DS2148G 5V E1/T1/J1 Line Interface
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