Datasheet

Table Of Contents
RD–
RD–
RD+ RD+
49.9 W
49.9 W
Vdd
Vdd
0.1 Fm
0.1 F*m
TD– TD–
TD+
TD+
49.9 W
49.9 W
Vdd
0.1 Fm
0.1 F*m
1:1
1:1
T1
RJ45
Placeresistorsandcapacitorsclosetothedevice.
Common-modechokes
mayberequired.
Note:CentertapisconnectedtoVdd
*Placecapacitorsclosetothe
transformercentertaps
Allvaluesaretypicalandare 1%±
S0339-01
TLK100
SLLS931BAUGUST 2009REVISED DECEMBER 2009
www.ti.com
7 Design Guidelines
7.1 TPI Network Circuit
Figure 7-1 shows the recommended circuit for a 10/100 Mb/s twisted pair interface. Below is a partial list
of recommended transformers. It is important that the user realize that variations with PCB and
component characteristics require that the application be tested to verify that the circuit meets the
requirements of the intended application.
Pulse H1102
Pulse HX1188
Figure 7-1. 10/100 Mb/s Twisted Pair Interface
7.2 Clock In (XI) Requirements
The TLK100 supports an external CMOS-level oscillator source or an internal oscillator with an external
crystal.
7.2.1 Oscillator
If an external clock source is used, XI should be tied to the clock source and XO should be left floating.
The amplitude of the oscillator should be a nominal voltage of 1.8V.
36 Design Guidelines Copyright © 2009, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): TLK100