MAX98357 datasheet(4/9 Pages) MAXIM

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Evaluates: MAX98357A/MAX98357B

(WLP)

MAX98357 Development Board/

Evaluation System (WLP)

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 4 for

shunt positions.

External/Internal VDDIO (+1.8V to +3.3V)

On the DEV board, a logic voltage from a control interface

is needed for proper selection of the stereo input channel

through SD_MODE. This voltage can be applied exter-

nally at the VDDIO test point or it can be provided from

circuitry on the MAXAUDINT001# board. See Table 5 for

JU4 jumper selection.

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 and Shutdown

Operation section in the MAX98357 IC data sheet for

more information.

VDD Input Supply (+2.5V to +5.5V)

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

MAXAUDINT001# board. See Table 6 for JU6 jumper

selection.

Audio Interface Board

(MAXAUDINT001# Board)

The MAXAUDINT001# board provides USB-to-I2S data

conversion, as well as DC regulators that can be used

to power the devices. The USB-to-I2S converter on the

MAXAUDINT001# board allows for any computer to

become an I2S digital audio source without requiring

additional driver installation. On the MAXAUDINT001#

board, set SW1 to “demo” and set the I2S switch to con-

nected to source audio by USB. This allows for a quick

evaluation from a single USB connection. Using the

MAXAUDINT001# board as a power supply for high-pow-

er evaluation is not recommended as the input current is

limited. For high-power evaluation, use an external supply

connected to VIN.

Driving I2S Directly

To drive I2S directly, apply signals at the BCLK, LRCLK,

and SDIN test points, or on the J3 header, or between J3

pins 1-2 at the appropriate locations (signal and ground

are labeled on the board).

Evaluating the MAX98357B

The MAX98357 DEV board comes with a MAX98357A

populated on the board, but can also be used to evaluate

the MAX98357B. To evaluate the MAX98357B, carefully

remove the MAX98357A (U1) device from the board and

replace with the MAX98357BEWL+. No other component

changes are required.

Table 5. JU4 Jumper Selection (VDDIO)

Table 6. JU6 Jumper Selection (VDD)

*Default position.

Table 4. SW1 Jumper Selection

*Default position.

SHUNT

POSITION

LOGIC VOLTAGE (VDDIO)

1-2*

3.3V supplied by the MAXAUDINT001#

board connected to J1 header.

2-3

User-supplied external power supply applied

at the VDDIO test point.

SHUNT

POSITION

INPUT VOLTAGE (VDD)

1-2*

VDD supplied from the MAXAUDINT001#

board connected to the J1 header.

2-3

User-supplied external power supply applied

at the VIN PCB pad.

SWITCH

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

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