Datasheet

ADSP-BF609 EZ-KIT Lite Evaluation System Manual 1-21
Using ADSP-BF609 EZ-KIT Lite
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 VDD_USB,
VDD_EXT, and the 3.3V power requirements of the board. The Analog
Devices ADP1715 regulator provides 1.8V for VDD_DMC. The processor’s
VDD_INT is regulated to 1.25V by the ADP2119 controller.
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_EXT,
VDD_INT, VDD_DDR2, VDD_USB, 3.3V, and USB_VBUS voltage domains. For
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” on page 2-21.