UG-855 datasheet(8/29 Pages) AD

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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.

Figure 3. Selecting the Reference Source

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

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.

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.)

Connect the EVAL-SDP-CB1Z board to the PC using the

supplied USB cable.

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