DS2148 Dallas Semiconducotr, DS2148 Datasheet - Page 51

• Manufacturer Part Number: DS2148
• Description: 5V E1/T1/J1 Line Interface
• Manufacturer: Dallas Semiconducotr

BASIC INTERFACE Figure 9-1
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).
Transmit
Receive
Line
return loss is required for T1 applications.
When this feature is disabled, Rr = 37.5W for 75W, 60W for 120W E1 systems, or 50W for 100W
T1 lines.
Line
toward the network)
(larger winding
N:1
1:1
0.1µF
Rr
Rt
Rt
Rr
polarized)
0.47µF
(non
51 of 75
TTIP
TRING
RTIP
RRING
DS2148
V
V
V
V
DD
SS
SS
DD
MCLK
(21)
(22)
(35)
(36)
0.01µF
0.1µF
0.1µF
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
10µF
10µF
+V
DD