Analog Devices ADSP-21992 EZ-KIT LITE, Системное руководство

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System Architecture
3-2 ADSP-21992 EZ-KIT Lite Evaluation System Manual
System Architecture
This section describes the processor’s configuration on the EZ-KIT Lite
board.
The EZ-KIT Lite development system has been designed to provide access
to all the capabilities of the ADSP-21992 processor. For information
about configuring the boot mode, refer to
“Boot Mode and Bypass Mode
Select Jumpers (JP9-JP12)” on page 3-16 .
The processor core voltage is 2.5V, and the external interface operates at
3.3V. The analog input signal conditioning circuitry requires ±2.5V.
Power Supplies
Linear regulators are provided on the ADSP-21992 EZ-KIT Lite board for
the 2.5V and 3.3V required by the ADSP-21992 from a 5V source. The
linear regulators also provide the power for the digital peripheral circuitry
on the ADSP-21992 EZ-KIT Lite board.
Linear regulators are also provided for the ±2.5V from ±5V sources,
required by the analog input signal-conditioning circuitry. Appropriate
decoupling capacitors are provided on the ADSP-21992 EZ-KIT Lite
board for all power supply inputs (VDD, +AVDD, and -AVDD) to
reduce noise coupling from the external power supplies. However, for best
performance, well-regulated external power supplies and correct wiring are
recommended.
The ADSP-21992 EZ-KIT Lite board is laid out with separate analog and
digital ground planes, labeled AGND and DGND, respectively.
JP1
is a
link that connects the analog and digital ground planes of the
ADSP-21992 EZ-KIT Lite board.
!
For correct operation, do not remove this link.