Figure 3. Tlk3134 Evm Vddm Voltage Source Selection; Figure 4. Tlk3134 Evm Regulator Margin Selection - Texas Instruments TLK3134 XAUI User Manual

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The PTH05010WAS voltage regulators included on the TLK3134 EVM are adjustable and are
set with a single external resistor. Separate regulators have been provided and set to output
1.2V and 2.5V because both voltages are required simultaneously. However, since 1.5V and
1.8V are not necessarily required simultaneously, a single regulator has been configured to
provide both of those voltages, although not at the same time depending upon the jumper
position on JMP115 shown in the following figure. JMP115 selects between the 1.5V set resistor
and the 1.8V set resistor and connects one or the other to the Voltage Adjust pin of the regulator.
Figure 3. TLK3134 EVM VDDM Voltage Source Selection
JMP115
JMP115
1P5V
1P5V
VOLTAGE SELECT
VOLTAGE SELECT
1P8V
1P8V
1P8V
1P5V
SELECTED
SELECTED
The PTH05010WAS voltage regulators are also equipped with a +/- 5% selectable Margin
Control allowing easy testing of the device near the min/max voltage limits specified in the
datasheet. Place the jumper position to either the "UP 5%", "DN 5%", or "NOM" positions
keeping the center pin in common as demonstrated in the following figure.
Figure 4. TLK3134 EVM Regulator Margin Selection
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TLK3134 XAUI Transceiver / 4 Channel Multi-Rate Transceiver Evaluation Module (EVM) Users' Guide
SLLU104A - September 2007