Power Architecture; Power Measurements - Analog Devices ADSP-BF609 EZ-KIT Lite Manual

Limits to current and interface speed must be taken into consideration
when using the EI3. Current for the EI3 can be sourced from the EZ-KIT
Lite; therefore, the current should be limited to 200 mA for 5V and
300 mA for the 3.3V planes. If more current is required, then a separate
power connector and a regulator must be designed on the daughter card.
Additional circuitry can add extra loading to signals, decreasing their max-
imum effective speed.

Analog Devices does not support and is not responsible for the
effects of additional circuitry.

Power Architecture

The ADSP-BF609 EZ-KIT Lite has three primary voltage domains: 3.3V,
1.25V and 1.8V.
The Analog Devices ADP1864 controller provides 3.3V for the
, and the 3.3V power requirements of the board. The Analog
VDD_EXT
Devices ADP1715 regulator provides 1.8V for
is regulated to 1.25V by the ADP2119 controller.
VDD_INT

Power Measurements

Locations are provided for measuring the current draw from various power
planes. Precision 0.05 ohm shunt resistors are available on the
,
VDD_INT VDD_DDR2
current draw, the jumper is removed, voltage across the resistor can be
measured using an oscilloscope, and the value of the resistor can be mea-
sured using a precision multi-meter. Once voltage and resistance are
measured, the current can be calculated by dividing the voltage by the
resistance. For the highest accuracy, a differential probe should be used for
measuring the voltage across the resistor. For more information, refer to
Power Jumpers.
ADSP-BF609 EZ-KIT Lite Evaluation System Manual
, , , and
VDD_USB 3.3V
Using ADSP-BF609 EZ-KIT Lite
. The processor's
VDD_DMC
voltage domains. For
USB_VBUS
,
VDD_USB
,
VDD_EXT
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