DS26503L+ Maxim Integrated Products, DS26503L+ Datasheet - Page 77

• Manufacturer Part Number: DS26503L+
• Description: IC T1/E1/J1 BITS ELEMENT 64-LQFP
• Manufacturer: Maxim Integrated Products
• Type: BITS Elementr

Specifications of DS26503L+

• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency-max: -
• Output: -
• Input: -

13. LINE INTERFACE UNIT (LIU)
The LIU in the DS26503 contains three sections: the receiver, which handles clock and data recovery; the
transmitter, which waveshapes and drives the network line; and the jitter attenuator. These three sections
are controlled by the line interface control registers (LIC1–LIC4), which are described below.
The DS26503 can switch between T1 or E1 networks without changing any external components on
either the transmit or receive side.
In this configuration the DS26503, using a fixed 120Ω external termination, can connect to T1, J1, E1, or
6312kHz without any component change. The receiver can adjust the 120Ω termination to 100Ω, 110Ω or
75Ω. The transmitter can adjust its output impedance to provide high return loss characteristics for 75Ω,
100Ω, 110Ω, and 120Ω lines. Other components may be added to this configuration to meet safety and
network protection requirements. This is covered in the Recommended Circuits section.
Figure 13-1. Basic Network Connection
TRANSMIT
LINE
RECEIVE
LINE
2:1
1:1
Figure 13-1
60
10µF
shows a network connection using minimal components.
77 of 122
0.01µF
60
TTIP
TRING
RTIP
RRING
DS26503
CONNECTIONS
BACKPLANE