DS2148T+ Maxim Integrated Products, DS2148T+ Datasheet - Page 49

• Manufacturer Part Number: DS2148T+
• Description: IC LIU E1/T1/J1 5V 44-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS2148T+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 7-1. Basic Interface
NOTES:
1)
2)
3)
4)
Transmit
All resistor values are ±1%.
In E1 applications, the Rt resistors are used to increase the transmitter return loss (Table 7-1). No return loss is required for T1
applications.
The Rr resistors should be set to 60Ω each if the internal receive-side termination feature is enabled. When this feature is disabled, Rr
= 37.5Ω for 75Ω, 60Ω for 120Ω E1 systems, or 50Ω for 100Ω T1 lines.
See Table 7-1 and Table 7-2 for the appropriate transmit transformer turns ratio (N).
Receive
Line
Line
toward the network)
(larger winding
N:1
1:1
0.1µF
Rr
Rt
Rt
Rr
polarized)
0.47µF
(non
49 of 73
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