ADM7008
Function Description
PW_SAVE_TX = OFF or
Medium detect = ON or
FORCE_GOOD_LINK=ON in 10
M or
IDLE
Force in 100M mode
FLP = 80 mA(AN)
NLP = 80 mA(10M)
MLT3 = 40 mA(100M)
DRVON = 1
PW_SAVE_TX = ON and
Medium detect = OFF and
(Autonegiation enable = ON or
Force in 10M mode) and
FORCE_GOOD_LINK=OFF if 10 M
mode
TX
RG16DRV62MA =
ON
PWSAVING
MODE
LLP = 20 mA
or 60 mA(AN or 10M)
DRVON = 0
RG16DRV62MA =
OFF
NLP = 60 mA(10M)
FLP = 60 mA(AN)
DRVON = 0
Figure 3-26 Low Power Link Pulse during TX for Power Management
3.6 Voltage Regulator
ADM7008 requires two different levels, 3.3V and 1.8V, of voltage supply to provide the
power to different parts of circuitry inside the chip. ADM7008 has a build-in voltage
regulator circuitry to generate the 1.8V voltage from 3.3V power source. Therefore, an
external PNP power transistor is also needed and the block diagram of voltage regulator
is shown as below.
ADMtek Inc.
3-28
ETC [ ETC ]
