Reference

At power-up, the MAX5258 EV kit defaults to using the

on-board 4.096V reference.

To use VDD as the reference, place a shunt on jumper

JU7 in the 1-2 position. For off-board external references,

connect a user-supplied reference voltage to REF and

place a shunt on jumper JU7 in the 1-3 position. Type in

the reference voltage value in the Set Vref edit box and

press the Set Vref button. The MAX5258 EV kit software

uses the value in the Set Vref edit box to calculate the

input and output register voltage values. The Set Vref

edit box value does not affect the register values.

User-Supplied SPI Interface

To use the MAX5258 EV kit with a user-supplied SPI

interface, set the shunts as shown in Table 2. Then

apply an external 2.7V to 5.5V power supply to VDD.

Lastly, connect user-supplied

CS, SCLK, DIN, DOUT,

LDAC, and GND signals to the corresponding pins of

header H3.

User-Supplied Power Supplies

The MAX5258 EV kit is powered completely from the

USB port by default. Place jumper JU6 in the 1-4 position

and apply an external 2.7V to 5.5V power supply across

the corresponding VDD and GND pads. Lastly, see the

Reference section to choose the best reference option.

MAX5258 Evaluation Kit

6

_______________________________________________________________________________________

*

Default position.

Table 2. User-Supplied SPI Interface

Settings

JUMPER

SHUNT POSITION

JU1–JU5

2-3

JU6

1-4

JU7

1-2

JUMPER

SHUNT

POSITION

DESCRIPTION

1-2*

MAX5258

CS signal connected to

on-board microcontroller

JU1

2-3

MAX5258

CS signal connected to

on-board header H3

1-2*

MAX5258 SCLK signal connected to

on-board microcontroller

JU2

2-3

MAX5258 SCLK signal connected to

on-board header H3

1-2*

MAX5258 DIN signal connected to

on-board microcontroller

JU3

2-3

MAX5258 DIN signal connected to

on-board header H3

1-2*

MAX5258 DOUT signal connected to

on-board microcontroller

JU4

2-3

MAX5258 DOUT signal connected to

on-board header H3

1-2*

MAX5258

LDAC signal connected to

on-board microcontroller

JU5

1-3

MAX5258

LDAC signal connected to

on-board header H3

1-2

MAX5258 VDD is set to the on-board

+3.3V supply post regulated from

the USB port

1-3*

MAX5258 VDD is set to the on-board

+5V supply powered directly from

the USB port

JU6

1-4

Connect an external 2.7V to 5.5V

supply to the VDD pad

1-2

MAX5258 REF pin is connected

directly to VDD

1-3

Connect an external reference

voltage to the REF pad

JU7

1-4*

MAX5258 REF pin is connected to

the on-board 4.096V reference

Table 1. MAX5258 EV Kit Jumper

Descriptions (JU1–JU7)