MAX5581 EV Kit

The MAX5581 EV kit board provides a proven layout for

evaluating the MAX5581 4-channel, 12-bit DAC and

can be obtained separately without the CMODUSB

command module. The MAX5581 EV kit contains an on-

board reference and two momentary pushbutton

switches for testing the UPIO functions. The

MAX5581AETP (U1) is powered from two sources. The

user must supply +5V to AVDD. DVDD is provided by

the CMODUSB command module.

The DAC outputs can be set to full scale, midscale, or

zero at power-up. Jumper JU1 configures the DAC out-

puts at power-up as shown in Table 3.

Jumper JU2 gives the user the flexibility to connect

UPIO1 to the CMODUSB command module’s SPI MISO

line (DOUT) or to a UPIO1 user pad on the MAX5581

EV kit board. Table 4 shows the UPIO1 route selection.

The MAX5581 EV kit has an on-board MAX6126 +2.5V

reference, but also allows for a user-supplied external

reference (0.25V to AVDD). Cut the PC board trace

designated by jumper JU3 and apply an external refer-

ence to the REF pad. Table 5 shows the jumper JU3

reference type options.

Measure the supply current using jumpers JU4 and

JU5. Cut the PC board traces and place a current

meter in series with the two terminals of the corre-

sponding jumper. Table 6 shows the jumper JU4/JU5

current measurement options.

Jumper JU6 allows the user to select the clock edge

that latches-in the SPI data. Table 7 shows the jumper

JU6 clock edge options.

MAX5581 Evaluation Kit/Evaluation System

12

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JUMPER

SHUNT

POSITION

DESCRIPTION

1-2

DAC outputs set to full scale

upon power-up.

2-3*

DAC outputs set to zero upon

power-up.

JU1

Open

DAC outputs set to midscale

upon power-up.

Table 3. Power-Up State Select Input (PU)

*Default configuration.

JUMPER

SHUNT

POSITION

DESCRIPTION

1-2*

Data latched in on the rising

edge of SCLK.

JU6

2-3

Data latched in on the falling

edge of SCLK.

Table 7. Data Latch-In Clock Edge Select

*Default configuration.

JUMPER

SHUNT

POSITION

DESCRIPTION

1-2

UPIO1 user pad.

JU2

2-3*

CMODUSB’s SPI MISO line

(DOUT). Required for readback

commands in MAX5581 EV kit

software.

Table 4. UPIO1 Route Selection

(DOUT/UPIO1)

*Default configuration.

JUMPER

PC BOARD

TRACE

DESCRIPTION

Short*

On-board MAX6126 +2.5V

reference option.

JU3

Open

Cut the trace and attach an

external reference to the REF

pad.

Table 5. Reference Selection (REF)

*Default configuration.

JUMPER

PC BOARD

TRACE

DESCRIPTION

Short*

Normal operation.

JU4/JU5

Open

Cut the trace and attach a

current meter in series with the

two open terminals to measure

the supply current of AVDD

(JU4) and DVDD (JU5).

Table 6. Supply Current Measurement

*Default configuration.