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DS2148 датащи(PDF) 52 Page - Dallas Semiconductor

номер детали DS2148
подробное описание детали  5V E1/T1/J1 Line Interface
PDF  75 Pages
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производитель  DALLAS [Dallas Semiconductor]
домашняя страница  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS2148 датащи(HTML) 52 Page - Dallas Semiconductor

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DS2148/Q48
52 of 75
PROTECTED INTERFACE USING INTERNAL RECEIVE TERMINATION
Figure 9-2
NOTES:
1) All resistor values are ±1%.
2) C1 = C2 = 0.1µF.
3) S is a 6V transient suppresser.
4) D1 to D8 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 the 60
W
receive termination resistance must be adjusted to match the line impedance.
7) The Rt resistors are used to increase the transmitter return loss (Table 9-1). No return loss is required
for T1 applications.
8) The transmit transformer turns ratio (N) would be 1:1.36 for 5V operation.
9) The 68
mF 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
0.47uF
(non-
polarized)
VDD (21)
VSS (22)
0.1uF
VDD (36)
VSS (35)
0.1uF
+VDD
0.01uF
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
MCLK
+VDD
S
C1
D1
D2
D3
D4
1:1
Rp
Fuse
Rp
Fuse
+VDD
C2
D5
D6
D7
D8
Rt
Rt
68uF
S
(optional)
Transmit
Line
Rp
Fuse
Rp
Fuse
(optional)
10uF
10uF
0.1uF
60
60



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