lxt384 Intel Corporation, lxt384 Datasheet - Page 54

• Manufacturer Part Number: lxt384
• Description: Octal T1/e1/j1 Short Haul Transceiver
• Manufacturer: Intel Corporation

Intel
6.4.4
6.4.4.1
6.4.4.2
54
®
LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
Transmitter Output Driver Power and Grounds
Each output driver is supplied by its own separate TVCC and TGND pins. The TVCC pins can be
either 3.3 V or 5 V nominal. The LXT384 Transceiver drives either a 75Ω coaxial cable or a 120Ω
twisted-pair cable.
For output drive short-circuit protection, see
Transmit Output Standard Power Options
The LXT384 Transceiver standard option uses a 1:2 transformer with two R
power option has more margin for return loss, compared to the low-power option discussed in the
following section.
Transmitter Output Low-Power Options
The LXT384 Transceiver has a low-power option that meets all other specifications, with a built-in
safety margin. This option allows a different turns ratio so that power can be saved on the LXT384
Transceiver power dissipation. To achieve this low-power option, select the turns ratio to 1:1.7 and
change the R
T
resistor to 10Ω. (See
Figure 6
and
Section 6.5, “Line-Interface
Table
21.)
Revision Date: September 22, 2005
Protection”.
T
= 11Ω resistors. This
Document Number: 248994
Revision Number: 004