TLK100_11 Datasheet, PDF (10/88 Pages) Texas Instruments – Industrial Temp, Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver

TLK100
SLLS931B – AUGUST 2009 – REVISED DECEMBER 2009
www.ti.com
2.10 Power Supply Configuration
The TLK100 provides best-in-class flexibility of power supplies.
• Single supply operation – If a single 3.3V power supply is desired, the TLK100 will sense the presence
of the supply and configure the internal voltage regulators to provide all necessary supply voltages. To
operate in this mode, connect the TLK100 supply pins according to the following scheme:
3.3V
Supply
1.0mF
0^..1mF
0.1mF
1.0mF
0.1mF
0.1mF
41
VDD33_V18
40
V18_PFBOUT
2
V18_PFBIN1
4
V18_PFBIN2
11
VDD33_VA11
10
VA11_PFBOUT
TLK100
5
RD–
49.9W
6
RD+
49.9W
8
TD–
49.9W
1
VA11_PFBIN1
7
VA11_PFBIN2
21
VDD33_VD11
20
VDD11
1.0mF
9
TD+
49.9W
17
VDD33_IO
29
VDD33_IO
3.3V
Supply
3.3V
Supply
0.1mF
3.3V
Supply
0.1mF
3.3V
Supply
0.1mF*
0.1mF*
1 :1
RD–
RD+
1 :1 T1
TD–
TD+
RJ 45
Figure 2-1. Power Scheme for Single Supply Operation
• Multiple Supply operation – When additional 1.8V and/or 1.1V external power rails are available, the
TLK100 can be configured in various ways as given in Table 2-1. This gives the highest flexibility for
the user and enables significant reduction in power consumption. When using multiple external
supplies, the internal regulators must be disabled by appropriate device connections.
– When an external 1.8V rail is available – Connect the external 1.8V to all following TLK100 pins to
enable proper operation: V18_PFBOUT (pin 40), V18_PFBIN1 (pin 2), V18_PFBIN2 (pin 4) and
VDD33_V18 (pin 41). In addition, connect the 1.8V rail to the transformer center tap to further
reduce the transmission power, as shown in Figure 2-2:
10
Pin Descriptions
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