Evaluation Board User Guide

UG-250

Rev. A | Page 3 of 12

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The AD5421 evaluation board requires one power supply

connection from LOOP− to LOOP+ (J7), a voltage in the

range from 5.5 V to 52 V can be applied if the on-board

MOSFET device (U2) is not enabled. With U2 enabled, the

voltage limit is the breakdown voltage of U2, which in this

case is 240 V. A load resistor can also be connected at J7.

LINK OPTIONS

Set the link options on the evaluation board for the required

operating setup before powering on the board. The functions

of the link options are described in Table 2.

Default Link Option Setup

The default link options are listed in Table 1.

Table 1. Link Options

Link No.

Option

LK1

Inserted

LK2

B

LK4

Inserted

LK6

Inserted

LK7

Inserted

Alarm_Dir

B

Rint_Rext

B

Range0

B

Range1

B

Reg_Sel0

A

Reg_Sel1

B

Reg_Sel2

A