ADSP-CM403F Datasheet, PDF (32/74 Pages) Analog Devices – Analog Devices

Power Architecture
Limits to current and interface speed must be taken into consideration
when using the expansion interface. Current for extenders connected to J2
or J6 can be sourced from the EZ-KIT Lite; therefore, the current should
be limited to 250 mA for 5V, and 200 mA from the 3.3V planes. If more
current is required, a separate power connector and a regulator must be
designed on the daughter card. Additional circuitry implemented on
extender cards can add extra loading to signals, decreasing their maximum
effective speed.
 Analog Devices does not support and is not responsible for the
effects of additional circuitry.
Power Architecture
The ADSP-CM403F EZ-KIT Lite has two primary voltage domains: 3.3V
and 1.2V. The main input is a 5V wall adaptor. The 5V source can be
selected via JP4 to input from the PWM connector (J7) as an alternative
to the wall power adaptor. Refer to PWM Connector (J7) and Power
Select Jumper (JP4) for details.
The Analog Devices ADP2119 controller provides 3.3V for the VDD_EXT
signal and the 3.3V power requirements of the board. The VDD_INT signal
is delivered through either Analog Devices regulator ADP2119 (VR1) or a
PNP transistor (Q1).
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, and 3.3V 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 measured using a preci-
sion multi-meter. Once voltage and resistance are measured, the current
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ADSP-CM403F EZ-KIT Lite Evaluation System Manual