MAX98358DEV#WLP datasheet(2/13 Pages) MAXIM

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Evaluates: MAX98358

MAX98358 Evaluation System

Quick Start

Recommended Equipment

● MAX98358 EV system

● 2.5V to 5.5V, 2A DC power supply

● USB audio source (from computer through an audio

media player such as iTunesM or Windows MediaM

player)

● 4Ω to 8Ω speaker

Procedure

The EV kit is fully assembled and tested. Follow the steps

below to verify board operation.

Caution: Do not turn on

the power supply until all connections are completed.

Audio interface board:

1) Connect USB cables to USB1 and USB2 on the

AUDINT board.

2) Set DVDD and VIO to 3.3V on their respective jumpers.

3) Set the I2S slider to the connected position.

PDM generator board:

4) Set the jumper on JU300 to position 2-3 and connect

5V to 5V_TP loop.

5) Apply I2S stream to JU6 header.

• If the Audio Interface Board is being used, then use

the jumpers on JU6. Set the jumpers to connect

the XMOS to FPGA pins (position 2-3) for each I2S

signal.

• If I2S data is provided by another means then

apply the signal to the column labeled FPGA

and the corresponding ground pin is applied to

the column labeled GND (position 2-1).

6) Upon power-up, the MAXPDMGEN1 board draws

roughly 20mA for 5–10 seconds while the on-board

FPGA is being programmed. Once the FPGA is

programmed and starts to output valid PDM data the

supply current drawn by the MAXPDMGEN1 board

is roughly 50mA. If the current never increases, then

the FPGA has not been programmed.

7) Make sure that SW300 and SW301 are in the connect-

ed position to route the PDM signals to the J2 header.

8) PDM CLK and data signals should be present on

the PDMINCLK and PDMINDAT test points on the

MAX98358 DEV board.

9) To toggle the PDM clock rate between 3.072MHz

and 6.144MHz toggle SW302 labeled OSR_SEL.

Position 1-2 is 3.072MHz and position 2-3 is the

6.144MHz.

MAX98358 DEV board:

10) Verify that shunts are installed as follows:

• JU2: Pins 1-3 (selects left channel)

• JU4: Pins 1-2 (power routed from the AUDINT board)

• JU5: Pins 1-5 (12dB gain)

• JU6: Pins 2-3 (power routed from the VIN binding

post and test point)

• SW1: Position 1-2 (part is on)

11) Set the power supply output to 5V. Disable the power

supply.

12) Connect the power supply ground terminal to the

GND binding post and the power supply positive

terminal to the VIN binding post on the DEV board.

13) With the audio source disabled, connect the USB

audio source to J1 on the DEV board.

14) Connect the speaker across the OUTP and OUTN

test points.

15) Enable the power supply output.

16) Enable the audio source.

17) Verify that the speakers are playing the audio source

signal.

Detailed Description of Hardware

The MAX98358 EV system is designed to allow a

thorough evaluation of the MAX98358 PDM digital input

Class D power amplifier. The DEV board can be used by

itself as a stand-alone evaluation board and driven directly

by audio test equipment. The DEV board can also be used

in conjunction with the AUDINT board, and PDM GEN

board to create an evaluation system. The AUDINT board

provides an easy-to-use USB audio to I2S converter. The

I2S data is fed to the PDM generator board that uses an

FPGA to convert the I2S data stream into a PDM data

stream. This allows for any computer to become a digital

audio source that can be used to evaluate the device.

The AUDINT board has DC regulators that can be used

to power the device. This allows for a quick evaluation

from a single USB connection. It should be noted that

iTunes is a registered trademark of Apple Inc.

Windows Media is registered trademark and registered service

mark of Microsoft Corporation.

MAX98358DEV#WLP Datasheet(PDF) 2 Page - Maxim Integrated Products

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