WJLXT385LE.B1 Cortina Systems Inc, WJLXT385LE.B1 Datasheet - Page 61

• Manufacturer Part Number: WJLXT385LE.B1
• Manufacturer: Cortina Systems Inc

Specifications of WJLXT385LE.B1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

6.4.4
6.4.4.1
6.4.4.2
Document Number: 249252
Revision Number: 006
Revision Date: 19-Jan-2006
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 LXT385 ransceiver 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 LXT385 ransceiver 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 LXT385 ransceiver 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 LXT385
ransceiver power dissipation. To achieve this low-power option, select the turns ratio to 1:1.7 and
change the R
T
resistor to 10Ω.
(SeeFigure 6
Intel
and
Section 6.5, “Line-Interface
®
LXT385 Octal E1 S/H PCM Transceiver with JA
Table
18.)
Protection”.
T
= 11Ω resistors. This
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