TLK111_14 Datasheet, PDF (43/110 Pages) Texas Instruments – PHYTER® Industrial Temperature 10/100Mbs Ethernet Physical Layer Transceiver

TLK111
www.ti.com
SLLSEF8B – AUGUST 2013 – REVISED JANUARY 2014
7.3 Thermal Vias Recommendation
(Extended temperature (125°C) grade only)
The following thermal via guidelines apply to DOWN_PAD, pin 49:
1. Thermal via size = 0.2mm
2. Recommend 4 vias
3. Vias have a center to center separation of 2mm.
Adherence to this guideline is required to achieve the intended operating temperature range of the device.
Figure 7-3 illustrates an example layout.
M0117-01
Figure 7-3. Example Layout
7.4 Fiber Networking Circuit
Figure 7-4 describes the recommended method to connect the PHY to the optic transceiver in fiber mode.
Vdd
50W
FXTDP
FXTDM
50W 130W 130W
PLACE RESISTORS AND
CAPACITORS CLOSE TO
THE FIBER TRANSCEIVER
0.1 mF
0.1 mF
130W 130W 130W
SD_IN
FXRDP
FXRDM
80W 80W
80W
80W
80W
All values are typical and are +/- 1%
PLACE RESISTORS
CLOSE TO THE FIBER
TRANSCEIVER
A. In addition to the traditional SD_IN connection to the optic Transceiver, The TLK111 support Auto and Manual SD_IN
functionality that does not require the use of the SD_IN input from the optic transceiver. Recommended transceiver:
AVAGO™ AFBR5803Z. For more details see the FIBCR2 (0x00FD) and FIBCR3 ( 0x0102) regsiters.
Figure 7-4. 100 Mb/s Fiber Pair Interface
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Design Guidelines
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