Datasheet

TLK105
TLK106
SLLSEB8A –AUGUST 2012–REVISED MARCH 2013 www.ti.com
9.5 POWER SUPPLY CHARACTERISTICS
The data was measured using a TLK10x evaluation board. The current from each of the power supplies is
measured and the power dissipation is computed. For the single 3.3V external supply case the power dissipation
across the internal linear regulator is also included. All the power dissipation numbers are measured at the
nominal power supply and typical temperature of 25°C. The power needed is given both for the device only, and
including the center tap of the transformer for a total system power requirement. The center tap of the
transformer is normally connected to the 3.3V supply, thus the current needed may also be easily calculated.
9.5.1 Active Power
PARAMETER TEST CONDITIONS FROM POWER PINS FROM UNIT
TRANSFORMER
CENTER TAP
100Base-TX /W Traffic (full packet 1518B
Single 3.3V external supply 203 73 mW
rate)
10Base-T /W Traffic (full packet 1518B rate) Single 3.3V external supply 96 211 mW
9.5.2 Power-Down Power
PARAMETER TEST CONDITIONS
(1)
FROM THE POWER SUPPLIES FROM TRANSFORMER UNIT
CENTER TAP
IEEE PWDN Single 3.3V external supply 12 5 mW
Passive Sleep Mode Single 3.3V external supply 71 5 mW
Active Sleep Mode Single 3.3V external supply 71 5 mW
(1) Measured under typical conditions.
76 Electrical Specifications Copyright © 2012–2013, Texas Instruments Incorporated
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