UG-855
EVAL-AD7124-4SDZ User Guide
Rev. 0 | Page 8 of 29
REFERENCE OPTIONS
The
EVAL-AD7124-4SDZ
includes an external 2.5 V reference
(the
ADR4525
) and an internal 2.5 V reference. The default
operation is to use the external reference input, which is set to
accept the 2.5 V
ADR4525
on the evaluation board.
The reference used for a conversion is selected by choosing the
reference in the configuration registers associated with Setup 0
to Setup 7. Switch between using the internal reference and
external reference by accessing the
AD7124-4
registers through
the pop-up windows (discussed in more detail in the following
sections) via the evaluation software. Figure 3 shows how to
select the reference source for Setup 0 to Setup 7. Figure 4
shows the ADC_CONTROL register setting that enables the
internal reference.
13
304-
00
3
Figure 3. Selecting the Reference Source
13304
-004
Figure 4. Enabling the Internal 2.5 V Reference
EVALUATION BOARD SETUP PROCEDURES
After following the instructions in the Software Installation
Procedures section, set up the evaluation and SDP boards as
detailed in this section.
Warning
The evaluation software and drivers must be installed before
connecting the evaluation board and
EVAL-SDP-CB1Z
board to
the USB port of the PC to ensure that the evaluation system is
correctly recognized when it is connected to the PC.
Configuring the Evaluation and SDP Boards
1.
Connect the
EVAL-SDP-CB1Z
board to Connector A or
Connector B on the
EVAL-AD7124-4SDZ
board. Screw
the two boards together using the plastic screw and washer
set included in the evaluation board kit to ensure that the
boards are connected firmly together.
2.
Connect the power supplies to the
EVAL-AD7124-4SDZ
board. The
EVAL-AD7124-4SDZ
board, by default, uses
the wall wart (dc plug) supply that accompanies the
evaluation kit. Connect this supply to J5 on the
EVAL-
AD7124-4SDZ
board. (For more information about the
required connections and available options, see the Power
Supplies section.)
3.
Connect the
EVAL-SDP-CB1Z
board to the PC using the
supplied USB cable.
