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DS2148 bảng dữ liệu(PDF) 49 Page - Maxim Integrated Products

tên linh kiện DS2148
Giải thích chi tiết về linh kiện  5V E1/T1/J1 Line Interface Unit
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DS2148 bảng dữ liệu(HTML) 49 Page - Maxim Integrated Products

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DS2148/DS21Q48
49 of 73
Figure 7-1. Basic Interface
NOTES:
1) All resistor values are ±1%.
2) In E1 applications, the Rt resistors are used to increase the transmitter return loss (Table 7-1). No return loss is required for T1
applications.
3) The Rr resistors should be set to 60
Ω each if the internal receive-side termination feature is enabled. When this feature is disabled, Rr
= 37.5
Ω for 75Ω, 60Ω for 120Ω E1 systems, or 50Ω for 100Ω T1 lines.
4) See Table 7-1 and Table 7-2 for the appropriate transmit transformer turns ratio (N).
RTIP
RRING
TTIP
TRING
Receive
Line
N:1
(larger winding
toward the network)
DS2148
0.47µF
(non
polarized)
VDD (21)
VSS (22)
0.1µF
VDD (36)
VSS (35)
0.1µF
+VDD
0.01µF
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
MCLK
1:1
0.1µF
Rr
Rr
Rt
Rt
Transmit
Line
10µF
10µF



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