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Evaluates: MAX98358

MAX98358 Evaluation System

Shutdown Mode

The device features a low-power shutdown mode that is

activated by setting jumper SW1 to pins 2-3. To exit shut-

down mode, set SW1 to pins 1-2 and select the desired

stereo input channel using jumper JU2. See Table 3 for

shunt positions.

External/Internal VDDIO (+3.3V)

On the DEV board, a logic voltage from a control inter-

face is needed for proper selection of the stereo input

channel through SD_MODE. This voltage can be applied

externally at the VDDIO test point, or it can be provided

from circuitry on the AUDINT board. See Table 4 for shunt

positions.

Other logic voltages can be used other than +3.3V. If

you want to use other logic voltages, resistors R3 and

R4 must be adjusted. Refer to the SD_MODE Pin and

Shutdown Operation section in the MAX98358 IC data

sheet for more information.

External/Internal Input Supply (VDD)

The device can accept an input supply from +2.5V to

+5.5V. This voltage can be applied externally at the

VDD and GND PCB pads, or it can be provided from the

AUDINT board. See Table 5 for JU6 shunt positions.

Audio Interface Board (AUDINT Board)

as well as DC regulators that can be used to power the

source. This allows for a quick evaluation from a single

USB connection. Using the AUDINT board as a power

supply for high-power evaluation is not recommended as

the input current is limited. For high-power evaluation, use

an external supply connected to VIN.

PDM Generator Board (PDM GEN Board)

The PDM GEN board provides a seamless means to

PDM GEN board also has its own set of DC regulators so

that the system can be powered from a single 5V supply.

The PDM generator board must be powered externally at

+5V_TP.

Driving PDM Directly

To drive PDM directly, make sure that the sliders (SW300

and SW301) are in the disconnected position or the DEV

board is physically separated from the rest of the EV SYS.

Apply signals at the PDMINDAT and PDMINCLK test

points or between J3 pins 1-2 at the appropriate locations

(pin 1 is signal ground).

Table 4. JU4 Jumper Selection

Table 5. JU6 Jumper Selection

*Default position.

*Default position.

Table 3. SW1 Jumper Selection

*Default position.

SHUNT POSITION

LOGIC VOLTAGE (VDDIO)

1-2*

3.3V supplied by AUDINT board connected to the J1 header.

2-3

User-supplied external power supply applied at the VDDIO test point.

SHUNT POSITION

INPUT VOLTAGE (VIN)

Installed*

VDD supplied from the AUDINT board connected to J1 header.

Not installed

User-supplied external power supply applied at the VIN PCB pad.

SHUNT POSITION

VDDIO VOLTAGE

DEVICE OPERATION

1-2*

VDDIO determined by JU4 jumper position

Normal

(input channel selected

through JU2 setting)

2-3

Connected to GND

Shutdown