TLK110 Datasheet, PDF (10/104 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK110
SLLS901A – DECEMBER 2011 – REVISED FEBRUARY 2012
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3.2 Power Supply Configuration
The TLK110 provides best-in-class flexibility of power supplies.
3.2.1 Single Supply Operation
If a single 3.3V power supply is desired, the internal regulator of TLK110 is used to provide the necessary
core supply voltages. Ceramic capacitors of 10µf and 0.1µf should be placed close to the PFBOUT (pin
23) which is the output of the internal regulator. The PFBOUT pin should be connected to the PFBIN1 and
PFBIN2 on the board. A small capacitor of 0.1µF should be placed close to the PFBIN1 (pin 18) and
PFBIN2 (pin 37). To operate in this mode the TLK110 supply pins should be connected as shown in
Figure 3-1
0.1μF
3.3V
Supply
Pin 22
(AVDD33)
Pin 13
(RD–)
49.9W
3.3V
Supply
3.3V
Supply
0.1μF
Pin 18
(PFBIN1)
Pin 23
(PFBOUT)
10μF
Pin 37 ^TLK110
(PFBIN2)
0.1μF
Pin 14
(RD+)
Pin 16
(TD–)
Pin 17
(TD+)
Pin 32
(VDD33_IO)
Pin 48
(VDD33_IO)
49.9W
0.1mF
49.9W
49.9W
3.3V
Supply
0.1mF*
3.3V
Supply
0.1mF*
0.1mF*
1:1
RD –
RD +
TD –
1:1 T1
TD +
RJ45
Figure 3-1. Power Connections for Single Supply Operation
10
Hardware Configuration
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