DS21348 Dallas Semiconducotr, DS21348 Datasheet - Page 51

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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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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
7. Rr = 37.5W for 75W or 60W for 120W E1 systems, or 50W for 100W T1 lines.
8. The Rt resistors are used to increase the transmitter return loss (Table 9-1). No return loss is required
9. The transmit transformer turns ratio (N) would be 1:2 for 3.3V operation.
10. The 68mF is used to keep the local power plane potential within tolerance during a surge.
adjusted to match the line impedance.
for T1 applications.
Transmit
Receive
Line
Line
Fuse
Fuse
Fuse
Fuse
(optional)
(optional)
Rp
Rp
toward the network)
Rp
Rp
(larger winding
N:1
1:1
0.1µF
Rr
S
Rt
Rt
Rr
470
polarized)
470
1.0µF
(non-
D3
D1
C1
51 of 73
+VDD
D2
D4
TTIP
TRING
RTIP
RRING
DS21348
VDD (21)
VSS (22)
VDD (36)
VSS (35)
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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