DS21348 Dallas Semiconducotr, DS21348 Datasheet - Page 49

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DS21348

Manufacturer Part Number
DS21348
Description
3.3V E1/T1/J1 Line Interface
Manufacturer
Dallas Semiconducotr
Datasheet
BASIC INTERFACE Figure 9-1
Transmit
NOTES:
1) All resistor values are ±1%.
2) In E1 applications, the Rt resistors are used to increase the transmitter return loss (Table 9-1). No
3) The Rr resistors should be set to 60W each if the internal receive-side termination feature is enabled.
4) See Table 9-1 and Table 9-2 for the appropriate transmit transformer turns ratio (N).
Receive
Line
Line
return loss is required for T1 applications.
When this feature is disabled, Rr = 37.5W for 75W or 60W for 120W E1 systems, or 50W for 100W
T1 lines.
toward the network)
(larger winding
N:1
1:1
0.1µF
Rr
Rt
Rt
Rr
polarized)
1.0µF
(non-
TTIP
TRING
RTIP
RRING
49 of 73
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

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