DS21348 Dallas Semiconducotr, DS21348 Datasheet - Page 50

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DS21348

Manufacturer Part Number
DS21348
Description
3.3V E1/T1/J1 Line Interface
Manufacturer
Dallas Semiconducotr
Datasheet

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Transmit
Receive
Figure 9-2 PROTECTED INTERFACE USING INTERNAL RECEIVE
TERMINATION
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 60W
7. The Rt resistors are used to increase the transmitter return loss (Table 9-1). No return loss is required
8. The transmit transformer turns ratio (N) would be 1:2 for 3.3V operation.
9. The 68mF is used to keep the local power plane potential within tolerance during a surge.
Line
Line
receive termination resistance must be adjusted to match the line impedance.
for T1 applications.
Fuse
Fuse
Fuse
Fuse
(optional)
(optional)
Rp
Rp
toward the network)
Rp
Rp
(larger winding
N:1
1:1
0.1µF
60
S
S
Rt
Rt
polarized)
1.0µF
(non-
60
D3
D1
D5
D7
C1
C2
+VDD
+VDD
D6
D8
D2
D4
TTIP
TRING
RTIP
RRING
50 of 73
DS21348
VDD (36)
VSS (35)
VDD (21)
VSS (22)
MCLK
0.01µF
0.1µF
0.1µF
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
10µF
10µF
+VDD
68µF

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