Evaluation Board Overview; Considerations - Analog Devices ADuC7026 Application Notes

EVALUATION BOARD OVERVIEW

The ADuC7026 evaluation board has the following features:
•
2-layer PCB (4" × 5" form factor).
•
9 V power supply regulated to 3.3 V on board.
•
4-pin UART header to connect to RS-232 interface cable.
•
20-pin standard JTAG connector.
•
Demonstration circuit.
•
32.768 kHz watch crystal to drive the PLL clock.
•
ADR291 2.5 V external reference chip.
•
Reset/download/IRQ0 push buttons.
•
Power indicator/general-purpose LEDs.
•
Access to all ADC inputs and DAC output from external
header. All device ports are brought out to external
header pins.
•
Surface-mount and through-hole general-purpose
prototype area.
•
External memories and latch footprint.

CONSIDERATIONS

•
This document refers to the MicroConverter ADuC7026
evaluation board Revision B1.
•
All references in this document to the physical orientation
of components on the board are made with respect to a
component-side view of the board with the prototype area
appearing in the bottom of the board.
•
The board is laid out to minimize coupling between the
analog and digital sections of the board. To this end, the
ground plane is split with the analog section on the left
side and a digital plane on the right side of the board. The
regulated 3.3 V power supply is routed directly to the
digital section and is filtered before being routed into the
analog section of the board.
Rev. A | Page 3 of 16
AN-744